dant years. the best effect. a great cleal of experiment with wires of different metals 3. Experiments were then tried with wires six inches in and of different lengths and thicknesses, that only tones ples will mak: five or six pounds. with their modulations could be produced; length and 0:001… … bear the tension required to reproduce sono- end of a board about three feet in length. rous vibrations, hence its low position. Near the opposite end was placed a post sup- 5. Very thin carbon pencil, 0°0625 inch diameter, was tried porting a hook, to which was attached one end of the wire…
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