TELEGRAPHING PICTURES
The diagram reproduced today shows in considerable detail the optical arrangements of the instrument used for the transmission of pictures and other facsimiles, described in this column last u-eek. The drawing shows the course of the beam of light from the light source, through the "chopper" which conVerts it into a. low-frequency signal, and a series of lenses and mirrors to the rotating head which scans the picture. The cylinder round which tho picture is wrapped during transmission is indicated only by a section of tho slit through which the light reaches the picture surface. Light reflected from tho picture returns through the same optical system as far as the small first mirror, but is here spread enough CO pass on, to bo focused upon a photoelectric cell.
The receiver is precisely similar except that the light source and "chopper "are replaced by a glow discharge lamp (of .the noon class). . This lamp is actuated by the received picture signals, suitably amplified, and the modulated light, focused by the optical system through the rotating head, falls upon a photographic film placed round the cjiinder. I
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Bibliographic details
Evening Post, Volume CXVIII, Issue 106, 1 November 1934, Page 23
Word Count
187TELEGRAPHING PICTURES Evening Post, Volume CXVIII, Issue 106, 1 November 1934, Page 23
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