Abstract

A device is described which automatically combs a list of wave numbers punched on a paper tape for pairs of lines having constant differences within a given tolerance, and records the wave numbers of these pairs on motion picture film. It supplements the spectrum interval sorter previously described, which makes use of the same punched tape and automatically places all similar intervals in juxtaposition so that frequently recurring intervals can be detected. The interval recorder is set successively for the various intervals which the interval sorter chart shows to be important. When a light beam passes simultaneously through holes in both upper and lower sections of a looped portion of the tape, a detecting photo-cell flashes an argon lamp which momentarily illuminates two wave number dials turning in synchronism with the motion of the tape, and records their readings. By means of a calibrated differential the two dials and the tape can be set for any desired wave number difference. By controlling the width of the scanning beam the tolerance for recording can be set equal to the interval variation which it is desired to include. With the aid of this machine and the interval sorter some 2000 lines in the spectrum of Ce II have been classified in a quadratic array by Albertson and the writer. The average difference between observed and calculated intervals, with wave-length measurements made on the automatic computing comparator described by the writer, is slightly over 0.01 cm−1.

© 1938 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. G. R. Harrison, R. S. I. 3, 753 (1932).
  2. G. R. Harrison, R. S. I. 4, 581 (1933).
  3. W. E. Albertson, Phys. Rev. 45, 304 (1934), Os I; W. E. Albertson and G. R. Harrison, Phys. Rev. 52, 1209 (1937), Ce II;unpublished material on Nd I, Nd II, Sa I, Gd II, Ce I, Ru I.
    [CrossRef]
  4. G. R. Harrison, J. O. S. A. 25, 169 (1935).
    [CrossRef]
  5. A preliminary report on this analysis appeared in Phys. Rev. 52, 1209 (1937).
    [CrossRef]

1937 (1)

A preliminary report on this analysis appeared in Phys. Rev. 52, 1209 (1937).
[CrossRef]

1935 (1)

G. R. Harrison, J. O. S. A. 25, 169 (1935).
[CrossRef]

1934 (1)

W. E. Albertson, Phys. Rev. 45, 304 (1934), Os I; W. E. Albertson and G. R. Harrison, Phys. Rev. 52, 1209 (1937), Ce II;unpublished material on Nd I, Nd II, Sa I, Gd II, Ce I, Ru I.
[CrossRef]

1933 (1)

G. R. Harrison, R. S. I. 4, 581 (1933).

1932 (1)

G. R. Harrison, R. S. I. 3, 753 (1932).

Albertson, W. E.

W. E. Albertson, Phys. Rev. 45, 304 (1934), Os I; W. E. Albertson and G. R. Harrison, Phys. Rev. 52, 1209 (1937), Ce II;unpublished material on Nd I, Nd II, Sa I, Gd II, Ce I, Ru I.
[CrossRef]

Harrison, G. R.

G. R. Harrison, J. O. S. A. 25, 169 (1935).
[CrossRef]

G. R. Harrison, R. S. I. 4, 581 (1933).

G. R. Harrison, R. S. I. 3, 753 (1932).

J. O. S. A. (1)

G. R. Harrison, J. O. S. A. 25, 169 (1935).
[CrossRef]

Phys. Rev. (2)

A preliminary report on this analysis appeared in Phys. Rev. 52, 1209 (1937).
[CrossRef]

W. E. Albertson, Phys. Rev. 45, 304 (1934), Os I; W. E. Albertson and G. R. Harrison, Phys. Rev. 52, 1209 (1937), Ce II;unpublished material on Nd I, Nd II, Sa I, Gd II, Ce I, Ru I.
[CrossRef]

R. S. I. (2)

G. R. Harrison, R. S. I. 3, 753 (1932).

G. R. Harrison, R. S. I. 4, 581 (1933).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (3)

Fig. 1
Fig. 1

The spectral interval recorder, with cover, lamp, and mirror removed from in front of the wave number dials and camera lens.

Fig. 2
Fig. 2

Diagram showing the principle of operation of the interval recorder.

Fig. 3
Fig. 3

Two portions of records from the interval recorder. In two mirrors which bring the readings into juxtaposition, the readings of the two wave number dials are photographed on positive film whenever an argon lamp is flashed by the passage of holes in the tapes crossing the scanning beam.