Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 221
be done without at thesame time changing the frequency. 228. Vibrating Reed Type of Frequency Meter.—In this typeof instrument a number of steel strips are fastened at one end asshown in Fig. 215, while the current whose frequency is to bedetermined is passed through the coil A. The reeds are… … A—Interior construction.
Electrical engineering
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