Z 8225 POST TOP MOUNTING "DI-FRACTOR" LANTERN British Patents Nos. 424800, 408419 and 427835. Overall diameter 16 ins. Overall height 33½ ins. Weight (complete) 72 lbs.

G.E.C. Post Top Mounting Di-Fractor Street Light Lanterns

Totally enclosed dust-proof lantern, specially designed for use with OSIRA lamps. The body is of ornamental dome appearance made from heavy gauge spun copper. The detachable cast iron spigot cap is fixed to the cast iron ring on the main body of the lantern by means of two side supporting tubular arms. The copper top is held by three milled brass bolts to the cast iron ring. The optical system consists of a G.E.C. patent prismatic glass bowl refractor Z 6609. This refractor produces a high-grade road brightness with absence of glare. The light distribution from it is non-axial asymmetric, the main beams being 160° in plan. Also supplied with an axial asymmetric light distribution. It hs been more carefully designed by our Research Laboratories, and besides being optically efficient, it also acts as a completely dust-proof outer globe. It is held to the main body by a hinged cast ring which is secured by a lug and two spring fasteners, there is a slot in the ring to align the refractor with the body, the axis of the arms being at right angles to the road. A G.E.S. porcelain lampholder can also be used in two positions, so that the lantern is suitable for 250 and 400-watt OSIRA lamps. It is wired from the lampholder to a terminal block by means of heat resisting leads. Access to this by removal of the copper top. The external finish of the lantern is aluminium colour and all reflecting surfaces are heavily vitreous enamelled.

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