Meadowcroft, Wm. H. (William Henry), b. 1853 · New York & London, Harper & brothers · leaf 63
a piece of thin cardboard which will just fit over one endof the tube. Thispiece we will callthe diaphragm.Fasten the dia-phragm by pastingit with two strips ofthin paper to thetube. These stripsof paper should befastened only on theends, and the middle of the paper allowed tobe slack, as shown in… … Fig. 11 THE TELEPHONE sketch (Fig. 11), so that it will only just touchthe diaphragm. Now, if you speak into theopen end of the tube the diaphragm will vi-brate and the shot will be seen to move to andfrom it according to the strength of the vibra-tions. If we could by any means make a dia-phragm…
Electricity
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