Later sold as the Z 5337/8

Vitreous enamelled steel body, finished green outside and white inside. Complete with insulated suspension shackle and clear flint glass globe. Available in three sizes with or without reflector.

Later sold as the Z 5331

Body is made from high grade cast iron with a spun steel reflector. Finished green outside with white vitreous enamel for reflecting surfaces. Special provision is made for the ventilation. Supplied complete with clear flint glass.

Later sold as the Z 5333/4.

Has a vitreous enamelled steel body and reflector, finished green outside and white inside. Supplied complete with insulated suspension shackle and clear flint glass or opalescent globe.

Later sold as the Z 5335 and Z 5336.

Has a vitreous enamelled steel body and reflector, finished green outside and white inside. Supplied complete with insulated suspension shackle and clear flint glass or opalescent globe.

Later sold as the Z 5301/7 range.

This series represents a very complete range of conical reflector fittings, varying from 12" to 17½" in diameter and arranged for Osram lamps from 40 watts to 200 watts. Supplied in cast iron or mild steel with vitreous enamel or white porcelain reflecting surfaces. Standard tapping, ¾-in gas.

Later sold as the Z 5411 P.L.A.

Specially designed for dock lighting. The lamp is completely screened, and special attention has been paid to the securing and the strength and robustness which are so essential in lanterns used for such purposes. The top is fitted with a patented ventilated device operating on the ejector principle similar to that which has proved so successful on our well-known "WEMBLEY" Lanterns. The body is constructed of heavy gauge copper, finished stove enamelled green outside, and includes a Single Piece "Gecoray" Silvered Glass Reflector of special contour. The reflector is so designed to give an angle of cut-off of 65° for the prevention of glare. The mounting height recommended is from 30 to 35 feet, with a spacing of 110 feet apart.

Later sold as the Z 5201/16 range.

Is of the open reflector form. Can be supplied in various types providing an asymmetric distribution of light in two, three or four directions at angles to suit varying road widths, junctions, intersections and mounting arrangements. Silvered mirrored glass reflectors normally used but white opal glass can be substituted if desired. (Opal glass has an extremely long life when employed in corrosive or humid atmospheres but the intensity of the peak candle power is not so high as for mirror reflectors). The silvered mirror reflectors are of a single piece of glass bent ot the correct contour and cemented into the cast iron backings. Diffusing glass is used to prevent glare as the whole of the surface appears equally illuminated. The distribution is wider than htat provided by other similar types of unit and the intensity of the peak candle power is higher, due to the greater control of light effected by the larger surface area of the reflectors. The cast iron backings are easily detachable from the top and body of the fitting for: (1) Nesting for packing and stocking; (2) Facilitating wiring and erection; (3) For replacements and (4) Interchangeability. For use with clear OSRAM lamps. Standard taping ¾" gas. Focussing screw accessible and rapid. Stout durable copper body (top cylinder). Standard finish is green.

Later sold as the Z 5401/3 Clubfoot

Wembley lanterns of the Totally Enclosed Type. Made from heavy gauge spun copper, stove enamelled green outside and white inside. Can be supplied with an asymmetric type refractor (F5167/9) or a symmetrical type refractor (F5168/70). All have a clear glass outer globe. Standard tapping at top for fixing ¾in gas thread.

Wembley lanterns of the Totally Enclosed Type. Made from heavy gauge spun copper, stove enamelled green outside and white inside. Can be supplied with an asymmetric type refractor and ribbed glass outer globe (F5179) or a symmetrical type refractor and plain glass outer globe (F5177). A focusing device enables the lamp to be raised or lowered inside the refractor to vary the light distribution to suit the height and spacing of the units. The adjustment can be made from the outside without opening the lantern. Standard tapping at top for fixing ¾in gas thread.

Refractor: G 501, G 507 or G 513

Later sold as the Z 5041/53 York range.

The series of "Wembley" lanterns has been evolved as the result of many years of experience and research work. They incorporate a number of special features for ease of maintenance and maximum efficiency. The refractors are designed to give the maximum light output and ideal candle power distribution. This family is supplied without the outer enclosing globe, and are therefore more inexpensive models (see F 5451/7 below). Can take three different refractors: G 501 (symmetric), G 507 (non-axial asymmetric) and G 513 (axial asymmetric). Made from cast iron. Accessible and rapid rotatable refractor plate for lining up with the roadway without disturbing the joint between the bracket and lantern, and ensuring positive location of any of the three types of refractor. Refractor secured by cadmium-plated supports and phosphor-bronze springs. G.E.C. English-made prismatic glass refractor, giving maximum light output. Porcelain lampholder. Standard tapping is ¾" gas. Standard finish is green outside, with all reflecting surfaces white vitreous enamelled.

Refractor: G 501, G 507 or G 513

Later sold as the Z 5001/16 range.

The series of "Wembley" lanterns has been evolved as the result of many years of experience and research work. They incorporate a number of special features for ease of maintenance and maximum efficiency. The refractors are designed to give the maximum light output and ideal candle power distribution. This family are totally enclosed and therefore dustproof. An occasional wiping of the outer globe is all that is generally necessary to maintain maximum illumination. The interior will only need attention in this respect at the end of long periods and this can be done when it is necessary for the lanterns to be opened for lamp renewal purposes. (see F 5441/7 above). Can take three different refractors: G 501 (symmetric), G 507 (non-axial asymmetric) and G 513 (axial asymmetric). Made from heavy gauge copper body. Has an improved focussing device. Accessible and rapid rotatable refractor plate for lining up with the roadway without disturbing the joint between the bracket and lantern, and ensuring positive location of any of the three types of refractor. Refractor secured by cadmium-plated supports and phosphor-bronze springs. G.E.C. English-made prismatic glass refractor, giving maximum light output. Hinged steel outer reflector, vitreous enamelled for easy cleaning. Non-ventilated outer globe of English clear heat-resisting glass. Porcelain lampholder. Standard tapping is ¾" gas. Standard finish is green outside, with all reflecting surfaces white vitreous enamelled.

Later sold as the Z 5081/93 range.

Later sold as the Z 5061/73 range.

Later sold as the Z 5101/13 range.

Made from heavy gauge sheet copper. Enamelled green outside and white inside for reflecting surfaces. With copper top and ventilator. The ventilator is a patented device operating on the ejector principle is fitted combining extreme simplicity with highefficiency. This device causes a steady stream of air to be drawn into the lantern and ejected from beneath thetop cowl. Exhaustive tests have been carried out with this ventilating device, special attention being given tolamp performance. The result of these tests demonstrates convincingly that the ventilation is such as to safeguard the lamp from overheating and consequent reduction in normal life. The focusing device is a special patented feature which enables the lamp to be raised or lowered inside the prismatic refractor,thus varying the distribution of light to suit the height and spacing of units. All such adjustments in the largersize "WEMBLEY" lanterns are made from the outside without opening the lantern in any way. The lamp is lowered until the filament is sighted across the bottom edge of the refractor; the knob is turned a predetermined number of times to the right, and adjustments can be made to the 1/100th part of an inch. The lantern is made in various sizes to accommodate OSRAM gasfilled lamps of either 100 or 1500 watts, suitable for main thoroughfares, suburban streets and residential areas. The light emission is ideal for street lighting, the maximum candle-power being given at the useful angle of 70° from the vertical. The 300-500W GLS model (FC.6047) could be converted for use with OSIRA lamps by means of general conversion units - likewise the 1000-1500W GLS model could also be converted with similar kits.

Refractor: Z 6609

The 300-500W GLS model Wembley lantern (FC.6047) could be converted for use with OSIRA lamps by means of a general conversion unit. This included the Z 6609 bowl refractor, Z 0011 Type "D" top connecting box, Z Z609R felt gasket and Z 0609 wire net. This gave an asymmetric directional distribution suitable for road lighting.

Opal bowl: Z 6468

The 300-500W GLS model Wembley lantern (FC.6047) could be converted for use with OSIRA lamps by means of a general conversion unit. This included the Z 6468 opal bowl, Z 0011 Type "D" top connecting box and Z 7467 felt gasket. This gave a dispersive distribution suitable for area lighting.

Refractor: Z 6501, Z 6507 or Z 6513
Bowl: Z 6465 or 6475

Previously sold as the F 5451/7 range.

Z 5001/2/3 and Z 5011/2/3. Heavy gauage copper body. External focusing device. Accessible and easily rotable refractor plate for lining up with the roadway without disturbing the joint between the bracket and the lantern, and ensuring positive location of any of the three types of refractor. Refractor secured by cadmium-plated supports and phosphor-bronze springs. G.E.C. patent English-made prismatic glass refractor, giving maximum light output. Hinged steel outer reflector, vitreous enamelled for easy cleaning. Non-ventilated outer globe of English clear heat-resisting glass. Porcelain lampholder. Standing tapping, ¾-in. gas. Standard finish - Green outside, all reflecting surfaces white vitreous enamelled.
Z 5004/5/6 and Z 5014/5/6/. As above, expect that the body is robust cast iron construction, painted green externally and white internally.

Refractor: Z 6503, Z 6509 or Z 6515
Bowl: Z 6467 or 6477

Previously sold as the F 5179 range.

Heavy gauge copper body, external focusing and rotatable refractor plate. G.E.C. patent English-made prismatic glass refractor. Hinged vitreous enamelled steel outer reflector, with quick release spring fixings. Non-ventilated outer glboe of English clear heat-resisting glass, and durable felt gasket. Porcelain lamp-holder wired to standard terminal box (Type D) with heat-resisting leads. Standard tapping, 1-in. gas. The standard terminal box (Type D) is supplied for rigid fixing, with cable entry at sides for span wire fixing or overhead supply.Standard finish - Green outside, all reflecting surfaces white vitreous enamelled.

Refractor: Z 6503, Z 6509 or Z 6515
Bowl: Z 6467

Heavy gauge copper body of improved design, external focusing control and rotatable refractor plate. G.E.C. patent English-made prismatic glass refractor, hinged vitreous enamelled steel outer reflector with quick release spring fixing. Non-ventilated outer glboe of English clear heat-resisting glass and durable felt gasket. Porcelain lamp-holder wired to standard terminal box (Type D) with heat-resisting leads. Standard tapping, 1-in. gas. Standard finish - Aluminium colour. All reflecting surfaces white vitreous enamelled.

Refractor: Z 6505, Z 6511 or Z 6517
Bowl: Z 6469

Heavy gauge copper body, external focusing and rotatable refractor plate. G.E.C. patent English-made prismatic glass refractor. Hinged vitreous enamelled steel outer reflector, with quick release spring fixings. Non-ventilated outer glboe of English clear heat-resisting glass, and durable felt gasket. Porcelain lamp-holder wired to standard terminal box (Type D) with heat-resisting leads. Standard tapping, 1-in. gas. The standard terminal box (Type D) is supplied for rigid fixing, with cable entry at sides for span wire fixing or overhead supply.Standard finish - Green outside, all reflecting surfaces white vitreous enamelled.

Refractor: Z 6505, Z 6511 or Z 6517
Bowl: Z 6469

Heavy gauge copper body of improved design, external focusing control and rotatable refractor plate. G.E.C. patent English-made prismatic glass refractor, hinged vitreous enamelled steel outer reflector with quick release spring fixing. Non-ventilated outer glboe of English clear heat-resisting glass and durable felt gasket. Porcelain lamp-holder wired to standard terminal box (Type D) with heat-resisting leads. Standard tapping, 1-in. gas. Standard finish - Aluminium colour. All reflecting surfaces white vitreous enamelled.

Refractor: Z 6501, Z 6507 or Z 6513

Previously sold as the F 5441/7 range.

Cast iron top with vitreous enamelled steel reflector. Rotatable to align refractor. G.E.C. patent English-made prismatic glass refractor with quick release supports. Porcelain lampholder. Focusing is by means of a flexible bridge piece which is screwed to the interior lug, enamling four different positions of the lampholder to be obtained. Standard tapping, ¾-in. gas. Standard finish - Green outside, reflecting surface white vitreous enamelled.

Introduced in 1946.

Refractor: Z 6501, Z 6507 or Z 6513

Previously sold as the F 5471/7 range.

Cast iron top with vitreous enamelled steel reflector. Rotatable to align refractor. G.E.C. patent English-made prismatic glass refractor with quick release supports. Porcelain lampholder. Focusing is by means of a flexible bridge piece which is screwed to the interior lug, enamling four different positions of the lampholder to be obtained. Standard tapping, ¾-in. gas. Standard finish - Green outside, reflecting surface white vitreous enamelled.

Refractor: Z 6501, Z 6507 or Z 6513

Previously sold as the F 5461/7 range.

Heavy gauge copper body, with vitreous enamelled steel reflector below. Special ventilated and detachable top, with single fixing screw. Can be lined up with the roadway without disturbing the joint between bracket and lantern. G.E.C. patent English-made prismatic glass refractor, with quick release supports. Porcelain lampholder. Standard tapping, ¾-in. gas. Standard finish - Green outside, reflecting surface white vitreous enamelled.

Refractor: Z 6503, Z 6505,Z 6509, Z 6511, Z 6515 or Z 6517

Previously sold as the F 5485/7 range.

Heavy gauge copper body, with vitreous enamelled steel reflector below. Special ventilated and detachable top, with single fixing screw. Can be lined up with the roadway without disturbing the joint between bracket and lantern. G.E.C. patent English-made prismatic glass refractor, with quick release supports. Porcelain lampholder. Standard tapping, ¾-in. gas. Standard finish - Green outside, reflecting surface white vitreous enamelled.

Previously sold as the F 5156/61 range.

G.E.C. directional street lighting reflectors, open pattern, can be supplied in various types for providing an asymmetric distribution of light in two, three or four directions at angles between the reflectors to suit varying road widths, junctions, intersections and mounting. These are fitted with single piece silvered glass mirrors bent to the correct contour, and cemented into cast iron backings which assist in ensuring long life to the silvered surfaces. Diffusing glass used to prevent objectional glare, as with it the whole of the surface appears equally illuminated. The cast iron backing holding the silvered glass reflectors are easily detachable from the top and body of the fitting by unscrewing two nuts. This facilitates nesting for packing and stocking; wiring and erection; replacement in the event of breakage; and has the additional great advantage of interchange ability, as tops and bodies are universal for all patterns. Robust cast iron top. External focusing screw, heavy gauge copper body. Single piece English-made diffusing mirror glasses secured by special cement in protecting iron casting. Standard tapping, ¾-in. gas. Standard finish - Green

Previously sold as the F 5090/6 range.

This series represents a very complete range of conical reflector fittings, varying from 12 ins. to 17¾ ins. in diameter and arrnged for OSRAM lamps from 400 watts to 200 watts. They are supplied in cast iron or mild steel, with vitreous enamel or white porcelain reflecting surfaces. Standard tapping, ¾-in. gas

Previously sold as the FA 8167

Globe: Z 6451

Body of high-grade cast iron, with spun steel reflector. Finished aluminium colour outside, and white vitreous enamel reflecting surface. Supplied with clear flint glass, 6½ ins. diam., 6 7/8 ins. deep. Tapped ½-in. gas thread.

Globe: Z 6455

Body of high-grade cast iron. Finished aluminium colour outside, white inside. Supplied complete with clear glass, 8 ins. diam., 7¾ ins. deep. Tapped ¾-in. gas thread.

Previously sold as the F 8260 and F5101.

Globe: Z 6451 or Z 6453

Vitreous enamelled steel body and reflector, finished green outside and white inside. Supplied complete with clear flint or opalescent globe. Insulated shackle suspension.

Previously sold as the F 8266 and F5103.

Globe: Z 6455 or Z 6457

Vitreous enamelled steel body and reflector, finished green outside and white inside. Supplied complete with clear flint or opalescent globe. Insulated shackle suspension. Can be suuplied with ¾-in. gas or electric thread tapped nozzle at top, for rigid fixing in place of shackle if desired.

Previously sold as the FA 8166 and F 5111.

Globe: Z 6455 or Z 6441

Vitreous enamelled steel body and reflector, finished green outside and white inside. Supplied complete with clear flint globe. Supplied with ¾-in. gas or electric thread tapped nozzle at top, for rigid fixing.

Previously sold as the F 5163/5 Asymmetric Reflector

The above reflector fitting, which is of the open type, consists of a cast iron body, painted green outside, equipped with a cemented-in asymmetric type silvered glass interior reflector, of special contour, arranged to direct the light up and down the street and over the roadway in such a manner as to increase materially the lighting at the point midway between the standards, where the illumination is usually very low. It is particularly easy to clean as the interior surface of the reflector is quite smooth. The actual lamp filament is screened for view when approaching, thereby preventing glare. The fitting is most suitable for use at low mounting heights and normal spacing. Standard tapping for fixing is ½-in. gas thread.

Previously sold as the F 5155

Has been specially designed to comply with the Port of London Authority requirement for docks, also for use in car parks, factory yards, etc. The lamp filament is screened, and special attention has been paid to the securing of the strength and robustness which are so essential in lanterns used for such purposes. The top is fitted with a special ventilated device operating on the ejector principle. The body is constructed of heavy gauge copper, finished stove enamelled green outisde, and includes a single-piece "Gecoray" silvered glass reflector of special contour. The reflector is so designed as to give an angle of cut-off of 65° for the prevention of glare. Adjustment can be made to give an angle of cut-off of 65° for the prevention of glare. Adjustment can be made to give an angle of cut-off up to 71° where it is necessary to increase the distance apart. The mounting height recommended is from 30 to 35 feet, with a spacing of 110 feet apart. The body is of heavy gauge copper, non-ventilated and finished green. Fitted with a single-piece "Gecoray" reflector. Of light weight construction and very neat appearance. Maximum peak candle power intensity at an angle of 57° can be obtained with 65° cut-off. Maximum peak candle power intensity at an angle of 65° can be obtained with 71° cut-off. Standard tapping, 1-in. gas.

Has been specially designed to comply with the Port of London Authority requirement for docks, also for use in car parks, factory yards, etc. The lamp filament is screened, and special attention has been paid to the securing of the strength and robustness which are so essential in lanterns used for such purposes. The top is fitted with a special ventilated device operating on the ejector principle. The body is constructed of heavy gauge copper, finished stove enamelled green outisde, and includes a single-piece "Gecoray" silvered glass reflector of special contour. The reflector is so designed as to give an angle of cut-off of 65° for the prevention of glare. Adjustment can be made to give an angle of cut-off of 65° for the prevention of glare. Adjustment can be made to give an angle of cut-off up to 71° where it is necessary to increase the distance apart. The mounting height recommended is from 30 to 35 feet, with a spacing of 110 feet apart. The body is of heavy gauge copper, non-ventilated and finished green. Fitted with a single-piece "Gecoray" reflector. Of light weight construction and very neat appearance. Has a single knob external focusing control.

Maximum peak candle power intensity at an angle of 57° can be obtained with 65° cut-off. Maximum peak candle power intensity at an angle of 65° can be obtained with 71° cut-off. Standard tapping, 1-in. gas.

See also: Z 8155

Totally enclosed dust-proof lantern, specially designed for low wattage OSRAM gasfilled lamps constructed of heavy gauge spun copper body with cast iron top, omplete with porcelain enamelled steel inner and outer reflectors. The outer reflector is hinged and provided with a locating notch for a G.E.C. prismatic glass bowl refractor, which, with a felt gasket, makes the lantern dustproof. An inner symmetric refractor converts the light from the OSRAM lamp to the vertical shaped source for correct light distribution by the outer bowl refractor. An external focusing knob is provided so that the correct positions of the different wattage lamps can be immediately obtained. The lantern is supplied with a felt gasket. The patent G.E.C. top connecting box, designed to eliminate lamp failure due to water drip or condensation, is wired with heat-resisting leads to an E.S. porcelain lampholder.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavy vitreous enamlled. An important feature of this lantern is that by the removal of the inner symmetric refractor and the replacement of the inner reflector by one of a different shape the lantern becomes suitable for use with the 80 and 125-watt discharge lamps.

Introduced in 1936. First installation along Banbury Road, Oxford. For main road lighting. Designed to use the GLS lamp with the MA/V Glass Bowl Refractor - therefore an inner symmetric dome refractor is used to produce the vertically shaped light source for control by the outer bowl refractor.

Totally enclosed dust-proof lantern for use with 300/500-watt OSRAM gasfilled lamps, body constructed of heavy gauge spun copper with porcelain enamelled steel inner and outer reflectors. The outer reflector is hinged and provided with a locating notch for a G.E.C. single piece prismatic glass bowl refractor. This refractor was specially developed and designed by the G.E.C. research laboratories, and is identical with that used on the Di-fractor lanterns. It produces a very high standard of road brightness and at teh same time the whole surface of the bowl appears evenly illuminated, so avoiding the glare which is produced by less carefully designed imitations on which only a small section is flashed. An inner symmetric refractor prodcues the necessary vertical shaped light souce for control by the outer glass bowl refractor. An external focusing knob is provided so that the correct positions for the different sized lamps can be immediately obtained. The lantern is supplied with a felt gask and a wire net. The patent G.E.C. top connecting box designed to eliminate all danger of lamp failure due to water drop and condensation is wired with heat-resisting leads to the G.E.S. porcelain holder.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavily vitreous enamelled.

An important feature of this lantern is that by removal of the inner symmetric refractor and the replacement of the inner reflector by one of different shape, the lantern becomes suitable for use with OSRIA lamps.

Refractor: Z6301

The first lantern to use a discharge lamp. First installation along Watford Road, Wembely in March 1933. For main road lighting. Gives a non-cut-off distribution. Primary optical system consists of two refractor plates which spread the main beams in azimuth to spread the light across the road - no attempts are made to try to control the light in a vertical plane as it results in a patchy distribution. Secondary lighting system includes an white over-reflector and large base fitted with a diffuser - this is an attempt to increase the flux emitted directed below the lamp and increase the illumination below the lantern to avoid "dark patches." As the MA lamp burns hot, a metal framed lantern is used with special heat-resisting glass. Condensation along the bracket arm will break the MA lamp if dripped upon, so the lantern is fixed to the column by means of four, horizontal, separate side-bracket arms.. According to Gregory in 1940, the lantern "was particularly designed to avoid glare and give a good road brightness therefore becoming the first lantern consciously designed to produce high background brightness instead of high object brightness. Totally enclosed dust-proof lantern, specially designed for OSIRA lamps. Constructed of heavy gauge copper on cast gunmetal frame and provided with hinged bottom panel to give access for cleaning and re-lamping.The outer surfaces are finished aluminium. The lantern is supplied complete with porcelain enamel inner reflector and two special prismatic glass plate refractors to suit the light distribution of the OSIRA lamps. The lantern is glazed with spreader glasses, which give, in conjunction with the plate refractors,an asymmetric light distribution producing high and even road brightness. Fitted with external weatherproof connecting box, and wired internally with special heat-resisting conductors between the connecting box and G.E.S. porcelain lampholder, the latter being adjustable to vary the direction of the main beams. Had four bracket options: Z2001 for mounting to poles, Z2002 for mounting to flat walls, Z2003 for lantern and Z1900/9/11 box and Z2004 simplified bracket for flat walls. External finish is aluminium colour.

Refractor: Z6301

Totally enclosed dust-proof lantern, specially designed for OSIRA lamps. Constructed of heavy gauge copper with internal stiffening ribs and provided with hinged bottom panel to give access for cleaning an re-lamping. The outer surfaces are finished aluminium. The lantern is supplied complete with porcelain enamel inner reflector and two special prismatic glass plate refractors to suit the light distribution of the OSIRA lamp. The lantern is glazed with spreader glasses which give, in conjunction with the plate refractors, an asymmetric light distribution producing high and even road-brightness. The possibility of lamp failures due to water-drip or condensation is entirely eliminated by the patent external top connecting box. The lantern is wired internally with special heat-resisting conductors between the connecting box and the G.E.S. porcelain lampholder, the latter being adjustable to vary the direction ofthe main beams. In 1937, a new solid cast top was added to further prevent water drip. The external finish is aluminium colour

Refractor: Z6301

Totally enclosed dust-proof lantern specially designed for OSIRA lamps. Constructed of heavy gauge copper with internal stiffening ribs and provided with hinged bottom panel to give access for cleaning and re-lamping. The lantern is supplied completed with porcelain enamelled inner reflector and two special prismatic glass plate refractors to suit the light distribution of the OSIRA lamp. The lantenr is glazed with spreader glasses which give, in conjunction with the plate refractors, an asymmetric light distribution producing high and even road brightness. The possibility of lamp failures due to water drip or condensation is entirely eliminated by the patent external top connecting box. The lantern is wired internally with special heat-resisting conductors between the connecting box and the G.E.S. porcelain lampholder, the latter being adjustable to vary the direction of the main beams. The external finish of the lantern is aluminium colour.

Refractor: Z6300

Totally enclosed dust-proof lantern specially designed for OSIRA lamps. It has an ornamental stepped cast top with an iron frame body, and it is provided with a hinged bottom panel to give access for cleaning and re-lamping. The lantern is supplied complete with porcelain enamelled inner reflector and two special prismatic glass plate refractors to suit the light distribution of the OSIRA lamp. The lantenr is glazed with spreader glasses which give wih the plate refractors, an asymmetric light distribution producing that light level of road brightness which is so necesary if the road is to be well lighted. The lantern has been designed for use with either 150 or 250-watt OSIRA lamps. When used with 150-watt lamp an E.S> porcelain holder is required, but it is necessary to employ a G.E.S. porcelain lampholder when a 250-watt OSIRA lamp is in use. The lampholder is wired with heat-resisting leads to a connecting terminal block. A focusing device alters the asymmetery of the main light beams. A standard size of pole clamp is supplied enabling the lantern to be attached to poles of diameter between 4½in. and 5½in. The external finish of the lantern is aluminium colour.

Refractor: Z6301

Totally enclosed dust-proof lantern specially designed for OSIRA lamps. The body is onstructed of heavy gauge copper with internal stiffening ribs, with a hinged bottom panel to give access for cleaning and re-lamping. The upper canopy overhangs the main frame of the body. Two special prismatic glass plate refractors when used with the spreader glasses produce an asymmetric light distribution. The optical system is specially designed by G.E.C. Research Laboratories to produce high and even road brightness with absence of glare. The lantern is supplied with an inner porcelain enamelled reflector with a G.E.S. lampholder so that the lantern is suitable for 250 and 400-watt OSIRA lamps, the lampholder being wired with heat-resisting conductors to a G.E.C. patent external top connecting box specially designed to eliminate all danger of lamp failure due to water drip or condensation. The external finish of the lantern is aluminium colour.

Totally enclosed dust-proof lantern specially designed for OSIRA lamps, constructed of heavy gauge copper with internal stiffening ribs and a hinged end panel to give access for cleaning and re-lamping. The spigot is of cast iron, is easily detachable and can be supplied in different sizes. The lantern is supplied with two special prismatic glass plate refractors specially designed to suit the light distribution of the OSIRA lamp. It is also glazed with spreader glasses which provide when used with the plate refractors, an asymmetric light distribution giving a high even road brightness. The lantern is supplied complete with a porcelain enamelled inner reflector with a focusing G.E.S. porcelain lampholder so that either 250 or 400-watt OSIRA lamps can be used. It is wired with heat-resisting leads from the lampholder to terminal connecting block. The external finish of the lantern is aluminium colour.

Opal bowl: Z6466

Totally enclosed, dust-proof lantern, specially designed for OSIRA lamps with a cast iron top and a spun dome shaped copper body, vitreous enamelled steel inner reflector and similar outer reflector secured by spring fasteners. The latter holds the Z 6466 stepped white opal globe. This, when used with a Z 7607 felt ring makes the lantern dustproof. The possibility of lamp failure due to water drip or condensation is eliminated by means of the G.E.C. patent top connecting box, which is wired by means of heat-resisting leads to an E.S. porcelain lampholder, correctly positioned for use with 150-watt OSIRA lamps.

The external finish of the lantern is aluminium colour, with all reflecting surfaces heavily vitreous enamelled.

Refractor: Z6607

A specially designed lantern to take the 150W MA/V lamp. Introduced in 1936.

Totally enclosed dust-proof lantern, specially designed for 150-watt OSIRA lamps. The lantern has a cast-iron top with a dome-shaped spun copper body with vitreous enamelled inner and outer reflectors. The lantern is notched to located the refractor which is held by the hinged outer reflector. The prismatic glass bowl refractor Z 6607 is precisely similar in its optical properties to the Z 6609 bowl refractor but smaller in size. The refractor is more fully described on the previous pages. The light distribution is non-axial asymmetric, the main beams being 160° apart in plan. The bowl refractor used in conjunction with the Z 7607 felt ring constitues an outer-dust-proof globe. A G.E.C. patent top connecting box, specially designed to eliminate all danger of lamp failure due to water drip or condensation, is wired with heat-resisting leads to an E.S. porcelain lampholder correctly positioned to take 150-watt OSIRA lamps.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavy vitreous enamlled.

Refractor: Z6609

This is the first version of the Di-Fractor Lantern to use the Glass Bowl Refractor-Diffuser designed for use with MA/V lamps. Totally enclosed dust-proof lantern, specially designed for OSIRA lamps. The body is of heavy guage copper with porcelain enamel steel inner and outer reflectors. The outer reflector is hinged and provided with a locating notch for the G.E.C. single piece prismatic bowl refractor-diffuser (Z 6609), which also acts as a dust-proof outer globe. The refractor has a non-axial asymmetric distribution, the two main beams being 160° apart in plan. The patented combination of refracting prisms and diffusing flutes provides a high degree of light control together with an increase of flashed area, the resultant distribution giving high and even road-brighness with a minimum of glare. The incorporation of refractor, diffuser and outer globe in one piece of accurate glassware gives a low absorption high efficiency unit. The possibility of lamp failures due to water-drop or condensation is entirely eliminated by the patent top connecting box. The narrow canopy may have proved problematic for heat dissipation from the hot MA/V lamp hence the far wider designs used later.

Opal bowl: Z6468

Introduced in 1937. Described as a "new type of GEC Di-Fuser street lighting lantern." Spun copper body with steel inner reflector supporting a "pleasingly stepped" low absorption flashed opal globe.

Totally enclosed dustproof lantern specially designed for use with 250 and 400-watt OSIRA lamps. The body is of spun copper of a symmetrical dome appearance. A vitreous enamelled steel inner reflector secures the Z 6468 stepped white opal globe. The diffuser bowl is of high quality low absorption flashed white opal glass. It is both pleasing in appearance and optically efficient, the whole bowl appearing equally bright and producing a highly diffused light. The bowl when used with a Z 7467 felt ring is a completely dustproof outer globe. It is secured by a vitreous enamelled steel outer reflector which is held by spring fasteners. The possibility of lamp failure due to water drip or condensation is eliminated by the patented G.E.C. top connecting box which is wired with heat-resisting leads to the G.E.S. porcelain lampholder, which can be used in either of two positions so that the lantern is suitable for both 250 and 400-watt OSIRA lamps.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavily vitreous enamelled.

Refractor: Z6609

Named after the first installation in Fulham, where the installation along the Fulham High Road was used to outline the importance of siting and light distribution for high, uniform road brightness. This installation which was inaugurated in February 1937 and included 460 lanterns. The largest installation using these lanterns was probably in Deptford in 1937.

Uses a patented combination of internal refracting flutes and external diffusing flutes which makes the night time appearance very pleasant since the whole refractor bowl appears uniformally bright and free from small areas of intense brightness which would produce glare. It enables long stretches of road to be illuminated in the most economical matter possible. Its optical design is such that light is emitted at high angles from the vertical, which makes it possible to employ the reflection properties of the road to their full extent, and to mount the lanterns more than 50 yards or more apart.

Totally enclosed dust-proof lantern, specially designed for use with 250-watt and 400-watt OSIRA lamps. Constructed of heavy gauge copper with porcelain enamelled steel inner and outer reflectors. The outer reflector is hinged and provided with a locating notch for a G.E.C. single piece prismatic bowl refractor, which also acts as a dust-proof outer globe. The light distribution is non-axial asymmetric, the main beams being 160° in plan. The G.E.C. patented bowl refractor enables so good a control of light to be obtained that a very high degree of road brightness is produced, and this is now the criterion by which street lighting should be judged. The lantern is wired with heat-resisting leads from the patent top connecting box, specially designed to eliminate all danger of lamp failure due to water drop or condensation. A two-positioned G.E.S. porcelain lampholder enables the lantern to be used with 250 or 400-watt lamps. A felt ring is provided for the refractor bowl.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavy vitreous enamlled.

Refractors: Z 6607 and Z 6501

See also: Z 5515

The outer refractor of this unit is used with the normal long-source HPMV lamp but it operates successfully with the short source and dome refractor. The effects of the horizontal prisms on the dome is to make the small source approximately equivalent optically to the long source lamp. The form of the light distribution below the horizontal is therefore comparable with that of the higher wattage units.

A totally enclosed dust-proof lantern specially designed for use with 80 and 125 watt OSIRA lamps. The lantern has a heavy gauge spun copper body with a cast iron top. The are inner and outer vitreous enamelled steel reflectors, the outer being hinged and provided with a locating notch to ensure the corrrect alignment of the prismatic glass bowl refractor Z 6607. The prismatic bowl refractor controls in plan the light which is bent downwards by the inner symmetric dome refractor Z 6501 as well as the direct light from the lamp, thus providing that high standard of road brightness whcih is now considered essential if good visibility is to be obtained. The light distribution is 160° non-axial asymmertic.

The lantern is fitted with a 3-slot B.C. lampholder which is wired with heat-resisting leads to the G.E.C. patent connecting box. This has been specially designed to eliminate all danger of lamp failure due to water drip or condensation.

The lampholder can be raised or lowered by means of a knurled knob projecting from the cast top, and the correct focal position for whichever wattage lamp in use can then be obtained.

The lantern can also be used with OSRAM tungsten filament lamps. It is then necessary to emply an E.S. lampholder.

The external finish of the lantern is aluminium colour and all reflecting surfaces are white vitreous enamelled.

Opal bowl: Z6468

Totally enclosed dustproof lantern specially designed for use with OSIRA lamps. The body is of ornamental dome appearance made from heavy gauge spun copper. The detachabel cast iron spigot cap is fixed to the cast iron ring on the main body of the lantern by means of two side supporting tubular arms. The copper top is held by three milled brass bolts to the cast iron ring. A stepped opal diffusing bowl of high quality low absorption flashed opal glass produces in conjunction with a vitreous enamelled steel inner reflector a diffused symmetric light distribution. The whole surface of the bowl is equally bright so that there is no glare or patchiness produced. It is held to the main body by a hinged cast ring, which is secured by a lug and two spring fasteners. A G.E.S. porcelain lampholder can be used in two positions so that the lantern is suitbale for 250 or 400-watt OSIRA lamps. It is wired from the lampholder to a terminal block by means of heat-resisting leads. Access to this is obtained by removal of the copper top. The external finish of the lantern is aluminium colour and all reflecting surfaces are heavily vitreous enamelled.

Refractor: Z6609

Totally enclosed dust-proof lantern, specially designed for use with OSIRA lamps. The body is of ornamental dome appearance made from heavy gauge spun copper. The detachable cast iron spigot cap is fixed to the cast iron ring on the main body of the lantern by means of two side supporting tubular arms. The copper top is held by three milled brass bolts to the cast iron ring. The optical system consists of a G.E.C. patent prismatic glass bowl refractor Z 6609. This refractor produces a high-grade road brightness with absence of glare. The light distribution from it is non-axial asymmetric, the main beams being 160° in plan. Also supplied with an axial asymmetric light distribution. It hs been more carefully designed by our Research Laboratories, and besides being optically efficient, it also acts as a completely dust-proof outer globe. It is held to the main body by a hinged cast ring which is secured by a lug and two spring fasteners, there is a slot in the ring to align the refractor with the body, the axis of the arms being at right angles to the road. A G.E.S. porcelain lampholder can also be used in two positions, so that the lantern is suitable for 250 and 400-watt OSIRA lamps. It is wired from the lampholder to a terminal block by means of heat resisting leads. Access to this by removal of the copper top. The external finish of the lantern is aluminium colour and all reflecting surfaces are heavily vitreous enamelled.