Top connection. Standard ¾-inch gas thread. Other tappings (¾in. to 1½ins.) to order.		Overall diameter 18 ins. Overhall height 26 ins. Weight (complete) 31½ lbs.
Z 5225 "OXFORD" LANTERN British Patents Nos. 458617, 424800, 408419, 427835, 876831.

G.E.C. "Oxford" Street Lighting Lantern

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.

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