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 254
Fig. 69. Hydraulic model, duplex telegraphy. … Plate V. Copyright by J. 11. White &■ Co.THOMAS ALVA EDISON. FOUR MESSAGES ON ONE WIRE 213 during condensers as already described in Chapter XIV(Fig. 60). He thus perfectly balanced the electrostaticcharge of the line, and duplex telegraphy at once becamea commercial success for both land and…
Technology · Fire · Electricity · Photography
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