Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color (1900)
Iles, George, 1852-1942 · New York, Doubleday & McClure co. · leaf 251
iving-station. Without theslightest C( infusion, the two despatches taketheir way together over the same wire As a rule in telegraphic practice it ispreferable that the double capacity of awire should be such as to permit mes-sages to be sent from both terminals atthe same time, rather than that… … Fig. 67. I doable-wound elec-tromagnet. A WIRES DUTY DOUBLED 211 of energy offers the inventor in perfection. For brevityssake but one of these plans will be described. Its successdepends on departing in a new way fromthe simplicity of the common electro- Two Messaees Go 1 J Together in Opposite…
Technology · Fire · Electricity · Photography
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