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 133
Fig. 30. Fig. 31. Magnetic lines of force. Electric lines of force. the current was br.oken the magnetism of the iron disap-peared (Fig-. 32). Professor Joseph Henry, in researches conducted from1828 to 1830, much improved Sturgeons device. That inventor had wound but one coilof copper wire a-round…
Fire · Electricity · Color photography
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