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172 
THE LIGHTING-UP OF SALVAGING OPERATIONS.
Page 81
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WHERE salvaging opeTPations have to be carried on after dark the need of some better means of lighting up the scene of operation than can be afforded by the ordinary lamps of the service vehicle becomes imperative. For this purpose Butlers, Ltd., of Atlantic Works, Grange Road, Small Heath, Birmingham, are making the Atlantic searchlight, which will be found adequate for the purpose. The searchlight is fitted with a 36 cp. gag-filled lamp adapted to be run off a 12-volt battery. It is mounted in a swivel and trunnion, so that It has not only an allround horizontal movement but also a vertical movement, enabling the searchlight to be pointed directly overhead. A base is provided by which it can be fitted to any convenient platform. A handle is also furnished to turn the light as desired, whilst the front is fitted with a guard which is easily removed for cleaning purposes. The light will give a beam divergence of about 6 inc., and will, it is claimed, illuminate; a light-coloured object over a width of
about 60 ft. at a distance of over 200 yards. A focusing arrangement is provided to inerease the divergence to about 30 degrees, the adaptor being movable' for this purpose.