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

Metropolitan-Vickers Electrical Co., Ltd., whose wide range of street-lighting lanterns was alraedy well-known in the pre-war years, re-entered the market with a no-less attractive range of lanterns and lamps. Small but valuable modifications have been incorporated in some of the lanterns, six of which are briefly described here. It will be seen that in several instances the lantern can be used with alternative types of lamp; for example, Mercury Discharge, Fluorescent Mercury Discharge, or Metal Filament.

The Trafford Lantern is designed to utilize to the full the advantages of broad distribution in plan and fine control in teh 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.

The mechanical construction of the Trafford lantern is exceedingly robust and consists in the main of a one-piece casting forming the canopy and bracket entry boss, and a detachable "hook-hinge" ring, which supports the bowl. The bowl is made of special heat-resisting glass which remains unaffected even when chilled water is sprayed on the bowl after it has been heated to a high temperature than could be obtained in actual service.

The body 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. Easily accessible porcelain-insulated terminals are connected to the lampholder by heat-resisting cable, and focusing is obtained by lamp carrier adjustment.

The standard pattern is "non-ventilated". When required for use with Fluorescent Discharge Lamps, a ventilated pattern is supplied.

The one-piece bowl refractor can be supplied in three forms, for two-way axial, two-way non-axial, or symmetrical distribution. The lantern offers an unusually wide range of light outputs because it can be used with any one of six lamps: (a) 250-watt or 400-watt Metrovick Mercury Discharge; or (b) 80-watt or 125-watt Metrovick Fluorescent Mercury Discharge; or (c) 300-watt or 500-watt Cosmos Gasfilled Metal Filament. A dome refractor and clear outer well glass is supplied for use with metal filament lamps.

A notable feature of this lantern is is pleasing symmetry, whcih is not impaired by the neatly disposed bracket entry.

The body is a weather-resisting aluminium alloy casting to which the bowl refractor is secured by means of a stout carrier ring fitted with a hook hinge and two wing-nuts. The open-piece canopy is a copper spinning, the inner reflector being of vitreous-enamelled sheet steel.

Like the "Gower" lantern it can be provided with alternative bowl refractors for two-way axial, two-way non-axial or symmetrical distribution, and it will ccommodate any of the same range of lamps.

This lantern is made in three different lengths to suit lamps of different outputs. It has a cast-iron top and cast aluminium endplates, the refractor plates being supported in stout copper channels. Each of the prismatic glass plates has both vertical and horizontal prisms to ensure maximum utilization of the light emitted by the lamp. The standard design embodies one-piece plates; but two-piece plates giving a smooth surface both outside and inside can be supplied. The standard distribution is at 160°, but a distribution of 180° can be supplied if required. The "Poplar" lantern is designed to accommodate a Metrovick Sodium Discharge lamp of 45, 60, 85 or 140 watts.

The body of the lantern is of stout sheet copper finished with heat-resisting aluminium paint; 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 that known as "non-ventilated dust-proof." Alternative lampholder positions are provided. Supplied with bowl refractors giving either two-way non-axial distribution, 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.