Z 8105 SMALL "DI-FRACTOR" LANTERN British Patents Nos. 424800, 408419 and 427835. Overall diameter 14 ins. Overall height 21 ins. Weight (complete) 20¾ lbs. Top connection. Standard ¾-inch gas thread. Other tappings up to 1½ins. to order.

G.E.C. Small "Di-Fractor" Lantern

Totally enclosed dust-proof lantern, specially designed for 150-watt OSIRA lamps. The lantern has a cast-iron top with a dome-shaped spun copper body with vitreous enamelled inner and outer reflectors. The lantern is notched to located the refractor which is held by the hinged outer reflector. The prismatic glass bowl refractor Z 6607 is precisely similar in its optical properties to the Z 6609 bowl refractor but smaller in size. The refractor is more fully described on the previous pages. The light distribution is non-axial asymmetric, the main beams being 160° apart in plan. The bowl refractor used in conjunction with the Z 7607 felt ring constitues an outer-dust-proof globe. A G.E.C. patent top connecting box, specially designed to eliminate all danger of lamp failure due to water drip or condensation, is wired with heat-resisting leads to an E.S. porcelain lampholder correctly positioned to take 150-watt OSIRA lamps.

The external finish of the lantern is aluminium colour with all reflecting surfaces heavy vitreous enamlled.

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