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 229
experimentalline in the EngHsh Channel; he proved the possibihty ofsignalling for two miles through a wire covered with gutta-percha, and so prepared the way for a venture which joinedthe shores of France and England. In 1850 a cable 25 miles in length was laid from Doverto Calais, only to prove… … Fig. 58.Calais-Dover cable, 1851. four wires, wound spirally so as to combine strength withflexibility ; these were covered with gutta-percha and sur-rounded with tarred hemp. As a means of impartingadditional strength, ten iron wires were wound round thehemp—a feature which has been copied in…
Fire · Electricity · Color photography
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
