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  1. Zeleny and 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.
    [Crossref]
  4. J.O.S.A. & R.S.I.,  17, p. 386; 1928.
    [Crossref]
  5. In 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. H. W. Edwards, 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.

1928 (1)

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

1926 (2)

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

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

1923 (2)

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

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

Edwards, H. W.

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

Erikson,

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

Fountain,

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

Zeleny,

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

J.O.S.A. & R.S.I. (2)

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

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

Laboratory Manual of Practical Physics, exp. 14 (1)

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

Manual of Physical Measurements (1)

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

S.S. & M. (1)

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

Other (4)

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.

In 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.

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