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  1. Zeleny & Erikson, Manual of Physical Measurements, p. 13; 1923.
  2. Fountain, Laboratory Manual of Practical Physics, exp. 14; 1926.
  3. J.O.S.A. & R.S.I., 13, p. 213; 1926.
  4. J.O.S.A. & R.S.I., 17, p. 386; 1928.
  5. Tn the circuit is included the impulse counter, which is not essential to the operation of the spark timer; it merely counts the vibrations of the bar.
  6. Edwards, H. W., S.S. & M., 23, p. 536; 1923.
  7. Sensitized paper is obtainable in widths of 1 inch and 2 inches.
  8. Acknowledgement is made to Professor M. N. States for a helpful suggestion. In his classes he has been using polar coordinate paper, coated with smoke on the reverse side; on this surface a tuning fork trace is made. After fixing, equal groups of undulations in the trace are counted out, and the division points transferred by a needle prick to the coordinate scale on the opposite side of the sheet.
  9. Rubber cement is a most useful laboratory aid.

Edwards, H. W.

Edwards, H. W., S.S. & M., 23, p. 536; 1923.

Other (9)

Zeleny & Erikson, Manual of Physical Measurements, p. 13; 1923.

Fountain, Laboratory Manual of Practical Physics, exp. 14; 1926.

J.O.S.A. & R.S.I., 13, p. 213; 1926.

J.O.S.A. & R.S.I., 17, p. 386; 1928.

Tn the circuit is included the impulse counter, which is not essential to the operation of the spark timer; it merely counts the vibrations of the bar.

Edwards, H. W., S.S. & M., 23, p. 536; 1923.

Sensitized paper is obtainable in widths of 1 inch and 2 inches.

Acknowledgement is made to Professor M. N. States for a helpful suggestion. In his classes he has been using polar coordinate paper, coated with smoke on the reverse side; on this surface a tuning fork trace is made. After fixing, equal groups of undulations in the trace are counted out, and the division points transferred by a needle prick to the coordinate scale on the opposite side of the sheet.

Rubber cement is a most useful laboratory aid.

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