CLEARSIDE 5580/1/2 LANTERNS
FOR OSRAM MERCURY, SODIUM OR TUNGSTEN FILAMENT LAMPS

MOUNTING
Top entry tapped 3/4 in. B.S.P. The lantern is locked to the bracket by a 1/4 in. dia. Allen type grub screw.

LANTERN BODY
Die-cast light alloy body, approximately 10 in. dia. (254 mm). A die-cast light alloy ring, hinged to the body and secured by a toggle catch, supports the enclosing bowl in use. The bowl is held in the ring by stainless steel clips permitting quick and easy removal. Two special synthetic rubber gaskets ensure a weatherproof seal when the lantern is closed. A cranked bridge-piece attachable to various pairs of lugs within the lantern body provides adjustment for the range of lamps that can be used.

The lantern body has three catalogue numbers depending on the type of lampholder required, viz. :-

Z5580 when fitted with a B.C. lampholder.
Z5581 when fitted with a three-pin B.C. lampholder (for mercury lamps).
Z5582 when fitted with an E.S. lampholder.

Refractor Bowls
Z6708 injection moulded 'Diakon' bowl refractor. The light distribution is 170° non-axial asymmetric.
Suitable for use with 60-150W pearl Osram tungsten filament lamp, or 80W MBF/U colour corrected mercury lamp. The lantern fitted with this bowl is illustrated on the front cover of the leaflet.
The injection moulded bowl has many advantages over conventional methods of manufacture. It provides a high degree of repetitional accuracy, more efficient light control by the highly finished prisms, greater impact resistance and light weight.

Z6608 axial asymmetric prismatic glass deep bowl refractor.

Z6606 axial asymmetric prismatic glass shallow bowl refractor.

Z6644 four-beam distribution prismatic glass bowl refractor.

All the above glass bowls, with the exception of Z6644, are suitable for use with 60-200W pearl Osram tungsten filament lamp or 80-125W Osram mercury MB/U or MBF/U colour corrected lamp. The Z6608 bowl will also accommodate a 45W Osram integral jacket or detachable jacket sodium lamp type SO/H.

The Z6644 four-beam distribution bowl is intended for use with 80-125W Osram mercury MBF/U lamps only.

The four-beam distribution is also particularly suitable for lighting of tree-lined roads (see A.P.L.E. Conferenece Paper No. 4, Folkestone 1955 - "The Lighting Of Tree Lined Roads" by H.M.Ferguson and W.R.Stevens). The intensity in directions near the line of trees is restricted so that light wasted in the foliage is reduced to a minimum and hard tree shadows are avoided; but a moderate amount of light is allowed at angles nar the horizontal to illuminate the trees for good appearance.

The light distribution was determined after extensive trials in residential roads. Not only have the usual vertical and conical light distributions been considered, but also the great circle distributions corresponding to lines along the street or building fontage parallel to the kerbs. These great circle distributions must be smooth and substantially 'flat-bottomed' if lighting is to appear reasonably uniform along the road, pavements, front gardens and buildings.

Z6475 rimpled glass diffusing outer globe.

Z6775 rimpled 'Perspex' diffusing outer globe.

All the above are suitable for use witha 60-200W pearl Osram tungsten filament lamp or 80-125W Osram mercury MB/U or MBF/U colour corrected lamp.

WEATHERING FINISH
The light alloy body is specially selected for its resistance to corrosion. Further protection is obtained by the use of a special one-coat aluminium-finish stove enamel.

ORDERING
The lantern can be specified with any combination of lampholder and enclosing bowl by quoting the body number followed by a reference letter for the glassware.

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