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
- a gift to science andart incomparably more valuable than thepermanent steel magnet could ever be.In America, from the beginning of electrictelegraphy until now, an electromag-net has been the indispensable heart of the apparatus.A momentary current from a distant station is receivedin a coil of… … Fig. 33.Henrys electro-magnet. io6 THE PRODUCTION OF ELECTRICITY becomes a magnet, and in attracting its armature gives asignal. If electricity was ever to take its place beside fire as aservant of equal or superior value, it was imperative thatan electric current should be generatedThe Dynamo is…
Fire · Electricity · Color photography
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