Z.8424/5 Side view of "Horizal" lantern. Sectional scale drawing. The iso-candle is based on an average lamp light output through life from a 400 watt OSRAM H.P.M.V. lamp. (13,600 lumens) . 250 w. 400 w. Directional intensity ratio 4.5 4.0 Light above horizontal 15% 15% Light output ratio 55% to 50%

"HORIZAL" LANTERN Top removed to show magnetic deflector assembly. Door opened at bottom of lantern to show access for cleaning and lamp replacement.

"Horizal" Lantern.

Use Main road lighting; 25 ft. mounting height; spacing 120 ft optimum, but can be used up to 150 ft. maximum; road width 30-40 ft. For roads over 40 ft. in width this lantern, with its horizontal burning lamp, will give better results than would be obtainable from a lantern with a vertical burning light source.

Lamp

Mounting Side entry. Requires a minimum length of 6 in. horizontal unthreaded 1¼ in. gas barrel When fully home, two 7/16 in. Allen type grub screws grip the barrel.

Lantern Body Die-cast light alloy body carrying the lampholder, terminal block, lamp steady, reflector plate and magnetic deflector. A water baffle and drainage hole a provided to carry off any water running along the bracket. A pressed light alloy top gives access to the deflector. An earthing screw is provided.

Lampholder Porcelain G.E.S. wired with heat-resisting wire to a terminal block. The lampholder is pivoted to assist in lamp withdrawl.

Over Reflector Immediately above the lamp is a non-magnetic polished reflector.

Magnetic Deflector On the reflector plate is mounted the magnetic deflector which is in series with the lamp and consumes 1 watt. The reflector plates serves the dual purpose of reflecting light and preventing rising hot air from over-heating the deflector. The use of a magnetic deflector enables a MA/H lamp with a hard glass outer jacket to be operated at the same efficiency as the normal MA/V lamp.

Optical System
There are two windows each fitted with prismatic glass refractors and sealed with lined diffusing cover glasses so that all glass surfaces are smooth. These windows face up and down the road. An opal panel in the front of the lantern faces across the road whilst a hinged door fitted with lined diffusing glass, underneath the lantern, gives access to the interior.

Weathering Finish The alloy used 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 enclosed with each lantern.

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