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References

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  1. L. A. Jones, Photographic Sensitometry (1931), pp. 61–63.
  2. L. A. Jones, Photographic Sensitometry (1931), pp. 55–60.

1931 (2)

L. A. Jones, Photographic Sensitometry (1931), pp. 61–63.

L. A. Jones, Photographic Sensitometry (1931), pp. 55–60.

Jones, L. A.

L. A. Jones, Photographic Sensitometry (1931), pp. 61–63.

L. A. Jones, Photographic Sensitometry (1931), pp. 55–60.

Photographic Sensitometry (2)

L. A. Jones, Photographic Sensitometry (1931), pp. 61–63.

L. A. Jones, Photographic Sensitometry (1931), pp. 55–60.

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Figures (4)

Fig. 1
Fig. 1

Circuit diagram of oscillator, power amplifier, and glow lamp assembly.

Fig. 2
Fig. 2

Circuit diagram of photo-cell amplifier, attenuator and vacuum tube voltmeter assembly. See Fig. 1 for circuit constants.

Fig. 3
Fig. 3

Comparison of readings of Eastman and a.c. photoelectric densitometers.

Fig. 4
Fig. 4

Oscillograms showing suppression of harmonics in amplifier.