Z 8405 "PLA-FRACTOR" LANTERN British Patents Nos. 458139, 424800. Diameter 11½ ins. Height 11½ ins. Weight 12½ lbs. Top connection. Standard tapping ¾-inch gas thread.

G.E.C. PLA-FRACTOR Street Lighting Lantern

An open type lantern specially designed for use with 80 and 125-watt OSIRA lamps. The body consists of a single piece refractor of special G.E.C. heat-resisting glass, the reflector portion being silvered, coppered and lead-backed, and is therefore weather resisting. The reflector contour is based on the design of the well known G.E.C. P.L.A. lantern, whilst the prisms mounted on the bottom band are of identical design to those on the G.E.C. prismatic bowl refractor and produce a 160° non-axial asymmetric light distribution. The prismatic refractor contols in plan the light which is reflected from the silvered portion of the glass, and well as direct light from the lamp, thus providing a very efficient optical system.

The glass body Z 6557 is securely held in a cast-iron top by an internal copper ring. The cast top has "Street Side" marked on it, and a locating lug on the reflector ensures this being replaced in the correct position after cleaning.

The lantern is fitted with a 3-slot B.C. lampholder. This is carried on a reversible nipple, which when screwed home ensures the correct focal position for either the 80 or 125-watt OSIRA lamp.

The lantern can also be used with OSRAM tungsten filament lamps, and it is then necessary to employ an E.S. lampholder. The catalogue number of the lantern when employed with filament lamps is Z 5405.

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