Z.9420 Lantern showing front opal panel and G.E.C. sealed prismatic refractor plates. Sectional scale drawing. The iso-candle is based on an average light output through life from a 45 watt OSRAM sodium lamp. (2000 lumens). 45 w. 60 w. Directional intensity ratio 2.0 1.9 Light above horizontal 10% 10% Light output ratio 70% 70%

LANTERN for SMALL SODIUM LAMPS Interior of lantern with reflector lowered to show wiring.

Side Road Lantern for Sodium Lamps.

Use Side road lighting; mounting height 13 ft. - 15 ft.; spacing 100 ft. - 120 ft. Greater spacing will produce dark areas between lanterns. Road width up to 30 ft.

Lamp Z.9420. For use with 45 w. or 60 w. OSRAM sodium lamp.

Mounting Top entry. The lantern entry is ¾ in. gas. It is supplied with a lock-nut.

Lantern Body Die-cast light alloy. A single piece casting with windows at the sides facing up and down the road and in the front. An earthing screw is provided.

Lampholder BC lampholder mounted on the reflector. The position is the same for both wattages of lamp.

Optical System Prismatic glass refractor plates are cemented into the windows at the sides of the lantern. These plates are normally supplied with plain cover glasses which seal the prisms so that all external glass surfaces are smooth. The refractors can be supplied without cover glasses but the small saving in cost effected is likely to be more than offset by the extra maintenance required. The front window is fitted with a curved panel of white flashed opal glass and allows light to fall across the road. Immediately above the lamp is a white enamelled reflector. This is hinged. When allowed to drop down it gives access to the lampholder wiring.

Weathering Finish The light alloy is specially selected for its resistance to corrosion. Further protection is obtained by the use of a suitable primer, undercoat and matt aluminium finish top coat.

Erection Instructions Full erection and focusing instructions are packed with each lantern.

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