Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 219
vance and the other will recede and the mirror will therebybe tilted about a vertical axis. If the current is alternating thenthe mirror will tilt backward and forward with a frequency equalto that of the current, and the deflection will be proportional tothe current. (The natural frequency of…
Electrical engineering
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