on, D, stretched in ametallicframe. defies vision, they open and close the circuit of the main description is not difficult, because all the effects that are wire. This, then, is all that is donesofar. Each vibration This ribbon is tuned to vibrate at a particular pitch. Now, produced by the… … crease the sound of power, and at the the vibrating rib- same time the bar on bons. A picture of the left is invested these boxes, arranged in symmetrical order, is also presented Just here it is necessary to explain a peculiar discovery with attractive power. To accomplish this was a simple…
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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-cu31924022817674-78-32.webp)
