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 46
the primary excitingcircuit by a string from outside, so that not even key connec-tions shall protrude, else exact optical experiments areimpossible. Even then, with the lid of the hat well clamped on, some-thing gets out, but it is not enough to cause serious dis-turbance of qualitative results.… … Fiq. 21.—General arrangement of experiments with the Copper Hat,showing Metal Box on a Stool, standing outside the Theatre. The Box isnot exactly represented, but inside it the Radiators were fixed with agraduated series of apertures ; the Copper Hat containing the Cohereris seen on the Table with…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
