An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 612
brating, when it may be readily noticed that the secondfork is also vibrating. It is necessary to have the two forks of the same tone ormusical note to get this effect in its fullest power. The secondfork vibrates because the sound waves beat upon it at a ratewhich is equal to the natural rate of… … Fig. 394. — Hertzian resonator orether-wave indicator. B, sparkgap. 546 ELECTRICITY AXD MAGXETISM may naturally respond to the ether wattes projected upon itby the oscillator in a manner that is analogous to that withwhich the second tuning fork responds to the sound wavesprojected upon it by the…
Electricity · Magnetism
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