METROPOLITAN-VICKERS ELECTRICAL CO., LTD., LONDON, W.C.2

This is the first type of an all-"Perspex" totally-enclosed refractor street lighting lantern to be produced. The unit consists of a hood, shaped from 3/16 in. opal "Perspex" and a lower hinged enclosing bowl. Specially designed "Perspex" refractors are sealed to the sides of the bowl, which is weatherproof when retained in its "closed" position. The lantern is intended for use with 85 and 140-watt Sodium Discharge Lamps. The following features are claimed for this lantern :-

• High optical performance. The "shock-press" method permits the refractors to be made to fine limits. The lantern has an efficiency of approximately 84 per cent.
• Ease of Erection and Maintenance. The lantern slides on to the bracket arm and is fastened by three readily accessible set screws. There is a special fixing process which prevents the intrusion of dirt.
• High Resistance to Corrosion
• Resistance to Mechanical and Thermal Shock

.

This is designed to utilize to the full the advantages of broad distribution in plan and fine control in the vertical plane inherent with an horizontal Mercury Vapour Lamp, and incorporates a bowl refractor controlling a maximum proportion of the light emitted by the lamp

This lantern is of heavy gauge sheet copper rivited to a cast iron canopy embodying a cool wiring chamber. The lantern has an inner reflector of vitreous-enamelled steel. Focusing is obtained by lamp carrier adjustment.

This lantern is suitable either for catenary suspension or pole mounting. The body consists of a light silicon-aluminium cast framework forming a rigid chassis. Felt gaskets and a deep beading to the roof render the lantern completely weatherproof. The aluminium reflectors and anti-glare shields can be easily removed, whilst a one-piece plastic cover protects the lamps, reflectors and shields from dust and damp.

Three 80-watt Metrovick 5-ft. Fluorescent Tubular lamps can be accommodated, with a total output of 6,800 lumens. All ferrous parts are corrosion-resisting.

The body is a weather resisting aluminkum alloy casting to which the bowl refractor is secured. The one-piece canopy is an aluminium spinning, the inner reflector being of vitreous-enamelled sheet steel. It can be provided with alternative bowl refractors for two-way axial, two-way non-axial or symmetrical distribution.

This lantern is made in three different lengths to suit lamps of different outputs. The standard distribution is at 160°, axial or non-axial. The "Poplar" lantern is designed to accommodate a Metrovick Sodium Discharge Lamp of 45, 60, 85 or 140 watts.

The lantern body and reflector comprise a one-piece casting of a special aluminium alloy. A clear outer globe is held in a cast hinged ring with felt gaskets to render the fitting dustproof. Provision is made for a 16-in. diameter vitreous enamelled reflector if required. A 6-in. diameter single-piece refractor is firmly secured to the lantern. The standard refractor produces a 170° non-axial distribution. Axial or symmetrical distribution can be provided if desired.

Pre-set focusing positions exist for the following : 100-watt metal filament, 150-watt metal filament or 80-watt mercury discharge, and 200-watt metal filament or 125-watt mercury discharge lamp.

Construction and lamp accommodation follow closely along the lines of the "Ryde" lantern, but this lantern is slightly smaller.

The body of the lantern is of sheet coppper; the cast iron canopy is removable to facilitate wiring. It has an inner and an outer reflector of vitreous-enamelled steel. The standard pattern is the "non-ventilated dust-proof." Alternative lamp-holder positions are provided. Supplied with bowl refractors giving either two-way non-axial distibution, or symmetrical distribution. Any of the following lamps can be used: (a) 80-watt or 125-watt Metrovick Mercury Discharge; or (b) 100-watt or 200-watt Cosmos Metal-filament.

This top-entry lantern has a one-piece body of cast-iron with a hinged vitreous-enamelled pressed-steel reflector which supports a clear glass (weather-excluding) bowl. An external adjuster head on the reflector canopy provides for lamp focusing. The six-inch diameter one-piece refractor is secured to an internal reflector by means of three spring-loaded hooks. Three types of refractor are available giving respectively two-way axial, two-way non-axial and symmetrical light distribution. This lantern accommodates (a) a 100-watt or 200-watt Cosmos Metal-filament lamp; or (b) an 80-watt or 125-watt Metrovick Mercury Dischage lamp. Either a B.C. (2-pin or 3-pin) or an E.S. lampholder is supplied with the lantern.