Z 8009 "BIRCHFIELD" LANTERN British Patents Nos. 408419 and 427835. Overall Height 27 ins. Width 18½ ins. Depth 15½ ins. Weight 41 lbs. Top connection. Standard tapping 1-inch gas thread. Other tappings to order (¾in. to 1½in.)

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

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.

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