Trebel, George. [from old catalog] · New York, F. Tousey · leaf 63
all of an insect, may be reproduced a considerabledistance, and be as audible as though the original sounds weremade close to the ear. If a person talk to the thin pineboard, his words will be distinctly heard in the receiver. The last subject which we will consider is the Storage orSecondary… … Take a piece of pine wood three inches wide by four incheslong, and fasten to it six plates of sneet lead, two incheswide by three inches long, about half an inch apart. Connectthe second plate with the fourtn, and the third with the fifth;this leave3 the first and sixth, which are positive and…
Electricity
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