is not difficult, because all the effects that are wire. This, then, is all that is done so far. Each vibration This ribbon is tuned to vibrate at a particular pitch. Now, produced by the magnetization and demagnetization of iron, it is a fact, that when a piece of iron is magnetized it is in- is… … sounding box, to in- the coil loses its crease the sound of power, and at the Fig. 1.-PR0FESS0R GRAY'S TELEPHONE IN NEW YORK. 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…
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![An illustration from XIXe [i.e. Dix-neuvième] siècle (en France); classes - moeurs - usages - costumes - inventions. Ouvrage illustré d'un front. chromotypographique, de 16 planches coloriées aux patrons, de 36 entetes et lettres ornées et de 487 gravures (dont 24 tirées hors texte) d'après les principaux artistes du siècle (1893)](https://img.insideoutlibrary.com/img/200/ia-xixeiedixneuvi00granuoft-512-360.webp)
