Abstract

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 use of these facts:

  • (1) The motion of a tuning fork and explanation of beats.
  • (2) Waves on liquids can be shown, including the case of beats.
  • (3) Slight phase changes may be shown when a heavy motor is connected to the line.
  • (4) An audio-oscillator may be calibrated.
  • (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.

© 1929 Optical Society of America

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References

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

Other (1)

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

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Equations (1)

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n v V - n h H = 1 V H t .