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  1. “Transmission of Pictures over Telephone Lines,” Bell System Technical Journal, April1925. “Some Photographic Problems Encountered in the Transmission of Pictures by Electricity,” J.O.S.A. & R.S.I.,  12, p. 173; 1926.
    [Crossref]
  2. Frederic E. Ives, 1878.
  3. “Tone Reproduction in the Halftone Photoengraving Process,” J.O.S.A. & R.S.I.,  13, p. 537; 1926.
    [Crossref]
  4. The use of the light valve to control the amount of light passing through an out-of-focus aperture, or an aperture with shaded edges, was given consideration, but dismissed as unsatisfactory in the light of the previous study of tone rendering by the screen process (reference 3).
  5. See reference 1 for pictures made substantially in this way.
  6. It is obvious that the dot so produced does not lie at the center of the space exposed by the passage of the sector disc. This could be arranged by the use of a pair of ribbons with a tab upon each, but this refinement is of no practical advantage.
  7. One due to Mr. P. Crisson of the American Telephone & Telegraph Co. will be described elsewhere.
  8. A stereotype copy of a bichromated gelatine relief print as used in making the first halftone plates (reference 2) would probably be superior to an etched plate for this purpose. Attention may be called to the fact that figures 7 and 10 have lost some of their characteristic dot shape in reproduction, largely through the etching process employed in making the printing plates.

1926 (1)

“Tone Reproduction in the Halftone Photoengraving Process,” J.O.S.A. & R.S.I.,  13, p. 537; 1926.
[Crossref]

1925 (1)

“Transmission of Pictures over Telephone Lines,” Bell System Technical Journal, April1925. “Some Photographic Problems Encountered in the Transmission of Pictures by Electricity,” J.O.S.A. & R.S.I.,  12, p. 173; 1926.
[Crossref]

Ives, Frederic E.

Frederic E. Ives, 1878.

Bell System Technical Journal (1)

“Transmission of Pictures over Telephone Lines,” Bell System Technical Journal, April1925. “Some Photographic Problems Encountered in the Transmission of Pictures by Electricity,” J.O.S.A. & R.S.I.,  12, p. 173; 1926.
[Crossref]

J.O.S.A. & R.S.I. (1)

“Tone Reproduction in the Halftone Photoengraving Process,” J.O.S.A. & R.S.I.,  13, p. 537; 1926.
[Crossref]

Other (6)

The use of the light valve to control the amount of light passing through an out-of-focus aperture, or an aperture with shaded edges, was given consideration, but dismissed as unsatisfactory in the light of the previous study of tone rendering by the screen process (reference 3).

See reference 1 for pictures made substantially in this way.

It is obvious that the dot so produced does not lie at the center of the space exposed by the passage of the sector disc. This could be arranged by the use of a pair of ribbons with a tab upon each, but this refinement is of no practical advantage.

One due to Mr. P. Crisson of the American Telephone & Telegraph Co. will be described elsewhere.

A stereotype copy of a bichromated gelatine relief print as used in making the first halftone plates (reference 2) would probably be superior to an etched plate for this purpose. Attention may be called to the fact that figures 7 and 10 have lost some of their characteristic dot shape in reproduction, largely through the etching process employed in making the printing plates.

Frederic E. Ives, 1878.

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Figures (12)

Fig. 1
Fig. 1

Apparatus for photoelectric halftone negative making as arranged with sending and receiving elements on one base, for purely local operation.

Fig. 2
Fig. 2

Method for producing a halftone structure of small rectangles.

Fig. 3
Fig. 3

Photomicrograph of halftone picture formed by small rectangular structure.

Fig. 4
Fig. 4

Method of producing halftone structure of square dots.

Fig. 5
Fig. 5

Overall characteristic of electrical system used on curved portion of rectifier characteristic.

Fig. 6
Fig. 6

Method of producing halftone structure of small squares, with each row displaced a half dot distance.

Fig. 7
Fig. 7

Halftone picture made with square dot structure of type shown in Fig. 6.

Fig. 8
Fig. 8

Photo-micrograph of halftone picture shown in Fig. 7.

Fig. 9
Fig. 9

Method of producing halftone structure of small squares similar in arrangement to ordinary screen made halftone.

Fig. 10
Fig. 10

Halftone picture produced by the method shown in Fig. 9.

Fig. 11
Fig. 11

Photo-micrograph of halftone picture made as shown in Fig. 9.

Fig. 12
Fig. 12

Tilting glass plate for introducing a shift of dot position at successive rotations of the film cylinder.