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| Colliery Engineering | December, 1934 |
W. E. Gray
THE GRAY-SUSSMANN No. 4C LAMP is of the 4-volt lead-acid type, its special feature being the hinged joint between the lantern portion and the welded steel accumulator container. It is claimed that this construction facilitates handling in the lamp room and lends itself to rapid assembly. The battery case is enamelled on the inside, tinned externally; the stamped steel hinged lid is secured to this case by a lead rivet locking device. An insulated plated reflector is fitted, and a screw switch and plunger contacts are carried on the lamp holder unit. A stout gunmetal top plate is provided and is supported by four steel standards which are secured to the steel lid of the battery case by means of nuts both inside and out. The lamp is equipped with a prismatic well glass and a 4-volt bulb of 3-watt rating. The total weight of the lamp is about 7½ lb.
Drawings and Photographs accompanying the article
Article reproduced from a copy of the magazine held at National Mining Museum Scotland, Newtongrange, Midlothian.
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