Abstract

A microphotometer has been designed and built to measure the granularity of photographic deposits in terms of two-dimensional variations in their transmitting properties. These measurements can be made in terms of either density or transmittance, and the diameters of the circular areas on which the measurements are made can be varied from 1.5µ to 78µ on the sample. Either Δ<i>D</i> or Δ<i>T</i>, the conventional density or transmittance differences from the mean, or <i>S</i>Δ<i>D</i> or <i>S</i>Δ<i>T</i>, the syzygetic density or transmittance differences between immediately adjacent surface elements of equal area, are measured and recorded automatically. The instrument will make a reading, record this reading, and move the sample to a new area at the rate of approximately one reading every three seconds. When a sufficient number of readings, normally at least 300, have been made, the recorder plots the results as a frequency distribution curve.

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  1. A. van Kreveld, Phot. J. 74, 590 (1934); J. Opt. Soc. Am. 26, 170 (1936); A. van Kreveld and J. C. Scheffer, J. Opt. Soc. Am. 27, 100 (1937). A. Goetz and W. O. Gould, J. Soc. Motion Picture Engr. 29, 510 (1937); Goetz, Gould, and Dember, J. Soc. Motion Picture Engrs. 34, 279 (1940); A. Goetz and F. W. Brown, J. Soc. Motion Picture Engrs. 39, 375 (1942). E. W. H. Selwyn, Phot. J. 75, 571 (1935); 79, 513 (1939).
  2. L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 35, 435 (1945).
  3. L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 36, 203 (1946).
  4. L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 37, 217 (1947).
  5. L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 41, 41 (1950).

Higgins, G. C.

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 41, 41 (1950).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 36, 203 (1946).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 37, 217 (1947).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 35, 435 (1945).

Jones, L. A.

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 37, 217 (1947).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 35, 435 (1945).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 36, 203 (1946).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 41, 41 (1950).

van Kreveld, A.

A. van Kreveld, Phot. J. 74, 590 (1934); J. Opt. Soc. Am. 26, 170 (1936); A. van Kreveld and J. C. Scheffer, J. Opt. Soc. Am. 27, 100 (1937). A. Goetz and W. O. Gould, J. Soc. Motion Picture Engr. 29, 510 (1937); Goetz, Gould, and Dember, J. Soc. Motion Picture Engrs. 34, 279 (1940); A. Goetz and F. W. Brown, J. Soc. Motion Picture Engrs. 39, 375 (1942). E. W. H. Selwyn, Phot. J. 75, 571 (1935); 79, 513 (1939).

Other

A. van Kreveld, Phot. J. 74, 590 (1934); J. Opt. Soc. Am. 26, 170 (1936); A. van Kreveld and J. C. Scheffer, J. Opt. Soc. Am. 27, 100 (1937). A. Goetz and W. O. Gould, J. Soc. Motion Picture Engr. 29, 510 (1937); Goetz, Gould, and Dember, J. Soc. Motion Picture Engrs. 34, 279 (1940); A. Goetz and F. W. Brown, J. Soc. Motion Picture Engrs. 39, 375 (1942). E. W. H. Selwyn, Phot. J. 75, 571 (1935); 79, 513 (1939).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 35, 435 (1945).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 36, 203 (1946).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 37, 217 (1947).

L. A. Jones and G. C. Higgins, J. Opt. Soc. Am. 41, 41 (1950).

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