Sound : an elementary text-book for schools and colleges (1913)
Capstick, John Walton, 1858- · leaf 168
of an electromagnet, and theintermittent current produced by the interruptor is passedthrough the coils. The fork will now have a periodic forceacting on it, and will be made to execute forced vibrationswith the period of the force. If the natural period of thefork is the same as that of the… … Fig. 74 Similarly, if the maintained fork has twice the frequencyof the interruptor fork there will be one impulse for each twovibrations, and in this case also large resonant vibrations willbe produced, and so on; any fork whose frequency is an exactmultiple of that of the interruptor having large…
Sound
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