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  1. The only sensitometric study I have found is in what was apparently intended to be a series of articles describing "Experiments on the Halftone Process" by A. J. Bull, W. J. Smith, and E. L. Turner, in "The Photographic Journal," 41, p. 8; 1917. The results obtained by these investigators are in general agreement with those here presented, although their direction of approach to the problem is quite different.
  2. "Some Photographic Problems Encountered in the Transmission of Pictures by Electricity," Ives, J.O.S.A. & R.S.I., March, 1926.
  3. See L. A. Jones, "Photographic Reproduction of Tone," J.O.S.A. & R.S.I., 5, p. 3; p. 232, 1921.
  4. Before the introduction of panchromatic "process" dry plates the structured negatives for three-color work had to be made by the wet plate process. This involved making first a set of color selection negatives on panchromatic dry plates. But it appears that the common procedure was to make the dot negatives from photographic positives, printed from the selection negatives, whereas, according to the results here presented, making the screened exposure on the negatives would have been preferable. The number of photographic copyings would have been the same.

Bull, A. J.

The only sensitometric study I have found is in what was apparently intended to be a series of articles describing "Experiments on the Halftone Process" by A. J. Bull, W. J. Smith, and E. L. Turner, in "The Photographic Journal," 41, p. 8; 1917. The results obtained by these investigators are in general agreement with those here presented, although their direction of approach to the problem is quite different.

Jones, L. A.

See L. A. Jones, "Photographic Reproduction of Tone," J.O.S.A. & R.S.I., 5, p. 3; p. 232, 1921.

Smith, W. J.

The only sensitometric study I have found is in what was apparently intended to be a series of articles describing "Experiments on the Halftone Process" by A. J. Bull, W. J. Smith, and E. L. Turner, in "The Photographic Journal," 41, p. 8; 1917. The results obtained by these investigators are in general agreement with those here presented, although their direction of approach to the problem is quite different.

Turner, E. L.

The only sensitometric study I have found is in what was apparently intended to be a series of articles describing "Experiments on the Halftone Process" by A. J. Bull, W. J. Smith, and E. L. Turner, in "The Photographic Journal," 41, p. 8; 1917. The results obtained by these investigators are in general agreement with those here presented, although their direction of approach to the problem is quite different.

Other (4)

The only sensitometric study I have found is in what was apparently intended to be a series of articles describing "Experiments on the Halftone Process" by A. J. Bull, W. J. Smith, and E. L. Turner, in "The Photographic Journal," 41, p. 8; 1917. The results obtained by these investigators are in general agreement with those here presented, although their direction of approach to the problem is quite different.

"Some Photographic Problems Encountered in the Transmission of Pictures by Electricity," Ives, J.O.S.A. & R.S.I., March, 1926.

See L. A. Jones, "Photographic Reproduction of Tone," J.O.S.A. & R.S.I., 5, p. 3; p. 232, 1921.

Before the introduction of panchromatic "process" dry plates the structured negatives for three-color work had to be made by the wet plate process. This involved making first a set of color selection negatives on panchromatic dry plates. But it appears that the common procedure was to make the dot negatives from photographic positives, printed from the selection negatives, whereas, according to the results here presented, making the screened exposure on the negatives would have been preferable. The number of photographic copyings would have been the same.

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