<p>The alternating current supply is a convenient source of current in frequency measurements and comparisons, unless high degree of constancy is desired. An ac arc also is.a fairly satisfactory intermittent source of light. A number of experiments are described, making useof these facts:</p><p>(1) The motion of a tuning fork and explanation of beats.</p><p>(2) Waves on liquids can be shown, including the case of beats.</p><p>(3) Slight phase changes may be shown when a heavy motor is connected to the line.</p><p>(4) An audio-oscillator may be calibrated.</p><p>(5) Reaction of closely and loosely coupled circuits may be mechanically demonstrated; and an explanation found for the difficulties sometimes encountered in Melde’s Experiment. Also, there are explained two useful theorems in connection with Lissajou figures.</p>

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  1. 1. J.O.S.A. & R.S.I., 14, pp. 263–285; and 15, pp. 25ff.

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1. J.O.S.A. & R.S.I., 14, pp. 263–285; and 15, pp. 25ff.

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