Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color (1901)
Iles, George, 1852-1942 · New York, Doubleday & McClure co. · leaf 239
ns were not of a dubious character, butfull and strong, from which it was manifest that an even smallerbattery would suffice to produce somewhat similar effects. At first in operating the Atlantic cable a mirror galva-nometer was employed as a receiver. The principle of thisreceiver has often been… … Fig. 61. Reflecting galvanometer. Z, lamp; N, moving spot of light reflected from mirror. On the same plan, the extremely minute motion of a gal-vanometer, as it receives the successive pulsations of amessage, is magnified by a weightless lever of light so that 2o6 CABLE TELEGRAPHY
Fire · Electricity · Color photography
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