Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 480
urely fixed at their edges, but the plate D, is, in addition, clamped atits middle by means of a screw. Only the plate C, therefore, is freeto move under the influence of the electrical charges in the two plates.A suitably shaped moutli piece is placed over the plate C, and a con-veniently shaped… … FxG. 5.—The DoU)ear Electro-Static Receiver. charge. In this condition they act like an electroscope and becomeexceedingly sensitive to any electrical change either of conduction orinduction. Indeed, the efficiency of the electro-static telephone dependsto a very great extent on this curious fact.…
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-54-12.webp)
