Signalling through space without wires : being a description of the work of Hertz & his successors (1900)
Lodge, Oliver, Sir, 1851-1940, Hertz, Heinrich, 1857-1894 · London : "The Electrician" Printing and Publishing Company, Limited · leaf 31
Fia. 17.—Early Form of Coherer, consisting of a spiral of thin iron wiremounted on an adjustable spindle and an aluminium plate. When thelever is moved clockwise the tip of the iron wire presses gently against thealuminium plate, whose end is bent at right angles and passed throughinto the hollow…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
