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 44
es into the closedbox. To screen it effectively, it is necessary to enclose batteryand galvanometer and every bit of wire connection ; the onlything that may be left outside is the needle of the galvano-meter. Accordingly, here we have a compact arrangement ofbattery and galvanometer coil and… … Fia. 19c.—Protected Detector. A is an occasional wire passing throughshuttered aperture. E is a lead tube enclosing leading wires, as in Fig. 21. action of the current in the coil has no difficulty in gettingthrough copper, as everyone knows : only a perfect conductorcould screen off that; but the…
Electric waves · Telegraph, Wireless · Electricity · Wireless Technology
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
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