Abstract

A sensitometer is described which affords a continuous variation of illumination across the sensitive surface. Two intensity-ranges are available, using the same source of light and the same exposure-time; with both ranges, the instrument can give an over-all variation of intensity in the ratio 2000 : 1. No lenses or moving parts are needed, and the sensitometer is strictly neutral with regard to wave-length.

© 1939 Optical Society of America

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References

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  1. L. A. Jones, Photographic Sensitometry (Eastman Kodak Company, 1934).
  2. L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).
  3. W. Kinder, Zeits. f. Instrument. 56, 393 (1936).

1936 (1)

W. Kinder, Zeits. f. Instrument. 56, 393 (1936).

1934 (1)

L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).

Jones, L. A.

L. A. Jones, Photographic Sensitometry (Eastman Kodak Company, 1934).

Kinder, W.

W. Kinder, Zeits. f. Instrument. 56, 393 (1936).

Silberstein, L.

L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).

Webb, J. H.

L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).

Phil. Mag. (1)

L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).

Zeits. f. Instrument. (1)

W. Kinder, Zeits. f. Instrument. 56, 393 (1936).

Other (1)

L. A. Jones, Photographic Sensitometry (Eastman Kodak Company, 1934).

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Figures (3)

Fig. 1
Fig. 1

Schematic perspective view of the sensitometer.

Fig. 2
Fig. 2

The aperture shown at C, Fig. 1.

Fig. 3
Fig. 3

A characteristic curve (c), showing the relationship between the density D and the intensity I, and formed by combining the two partial curves (a) and (b). Here (a) was exposed through the slit, the region pq being a sort of pinhole image of the rectangular part of the aperture of Fig. 2. Varying amounts of this rectangle are effective between s and t in (b), which was exposed with the straight-edge. The region uv can “see” the entire aperture. The useful part of the curve (c) is qu.

Equations (1)

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3 3 × 10 - k ξ d ξ sq. in.