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 187
two actions has longbeen displayed in this Ruhmkorff coil, an instrument built upof two closely wound coils, one of fine wire, the other of wirecomparatively coarse, the second coil surrounding the first.When a frequently interrupted current is sent through thethick wire it excites in the outer… … 158 ELECTRIC MACHINERY it to an intensity which may be a hundred times as greatIn stepping down the action is reversed: the receivedcurrent enters the coil of thin wire, and in its neighbourexcites pulses of much reduced tension. In its largest andbest designs this device has an efficiency of 90…
Fire · Electricity · Color photography
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