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  1. Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
    [CrossRef]

1925 (1)

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

Clark, A. B.

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

Horton, J. W.

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

Ives, H. E.

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

Parker, R. D.

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

Bell Technical Journal (1)

Bell Technical Journal, April, 1925: “Transmission of Pictures for Telephone Lines,” H. E. Ives, J. W. Horton, R. D. Parker, and A. B. Clark.
[CrossRef]

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Figures (11)

F. 1
F. 1

Schematic light valve.

F. 2
F. 2

Relation between illumination of photoelectric cell and light valve opening for various adjustments.

F. 3
F. 3

Enlargement of variable density picture.

F. 4
F. 4

Enlargement of variable sized structure picture.

F. 5
F. 5

Relation between brightness (bo) of original object photographed, transmission of sending end transparency (tS), opening of light valve (OV), and transmission (tR, tRP) or reflecting power (rR, rRP) of received photographic record obtained by various operations indicated. Variable density method of reception. O Negative to positive or print (correct tone rendering, 2 operations).V Positive to negative to print (correct tone rendering, 4 operations).X Positive to positive (incorrect tone rendering, 3 operations).□ Negative to negative to print (incorrect tone rendering, 3 operations).

F. 6
F. 6

Relation between brightness (bo) of original object photographed, transmission of sending end transparency (tS), opening of light valve (OV), and transmission (tR, tRP) or reflecting power (rR, rRP) of received photographic record obtained by various operations indicated. Variable sized structure method of reception. O Negative to positive to print (incorrect tone rendering, 2 operations).V Positive to negative to print (correct tone rendering, 4 operations).X Positive to positive (correct tone rendering, 3 operations).□ Negative to negative to print (incorrect tone rendering, 3 operations).

F. 7
F. 7

Characteristic curves and “virtual” characteristic curves of typical commercial film negative emulsion.

F. 8
F. 8

Characteristic curves of rapid bromide paper.

F. 9
F. 9

Negative emulsion characteristics plotted on linear scale.

F. 10
F. 10

Negative characteristics on linear scale, magnified to place 40 to 1 range between “dark” and “light” adjustments.

F. 11
F. 11

Facsimile characteristic obtained by distorting aperture over light valve, tS, transmission of sending end film; tR, transmission of received film.