Cooke, Troughton and Sims, of York, have developed in collaboration with London and North Eastern Railway, 8-v 5-w lamp; in test carried out, it gave illuminating power of 41.7 ft candles over area of 4.05 sq ft at distance of 31 ft 4 in., this corresponding to beam of 41,100 cp.
Cooke fog penetrating lamp
Ry Gaz
Railway Gazette ; 58 , n 3
1933
Aufsatz (Zeitschrift)
Englisch
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