experiments on a phonometer, or instru- whose rope is coupled to the chain hanging from the scoop again withdrawn and the box is pulled into position, and ia ment for measuring the mechanical force of sound waves box. When the scoop is sufficiently full the man on the ready for work as before. The… … EDISON'S PHONOMOTER. and throw his engine out of gear. After this is done the We take our illustration from periments he constructed the machine shown in the engrav- very large amount of work. ing, which exhibits the dynamic force of the voice. signal is then given to the opposite engineman to…
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