LEAFLET No. 108

No. 617

Vertical Distribution Curve With 140W Sodium Lamp.

A new totally enclosed Sodium lantern of novel design empolying a double reflecting system above and below the lamp.

Fitted above the lamp are two sepcially shaped mirror reflectors to re-directed the upwardly emitted light in two directions between 70^o and 80^o from the downward vertical.

Below the lamp and forming the bottom of the lantern is fitted a gable or inverted "V" section of clear glass, set so as to reflect by its FIRST SURFACE the downward light from the lamp to augment the directional beams at 70^o and 80^o. At the same time being clear glass, sufficient light is transmitted in the downward direction to illuminate the immediate neighbourhood of the lantern.

The "W" lantern, which is of pleasing appearance, is constructed with a cast hood of non-corrosive aluminium alloy and a sheet copper body which is glazed with shallow fluted glass sides and end with a clear glass base.

The interior is easily accessible for both lamp and reflectors, the body being hinged to the hood and fastened by a quick break safety catch.

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