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BBC Engineering 1922-1972 by Edward Pawley, Ch 3.6 p144 --
The Emitron camera was later superseded by the Super Emitron (image iconoscope), the CPS Emitron (orthieon) and the image-orthicon, but in the early days the difficulties inherent in the Emitron had to be offset as far as possible by extreme care in the adjustment of the scanning circuits, so as to reduce geometrical distortion and shading. The shading distortion in the form of ‘tilt and bend’ gave a great deal of trouble; the small control room at Alexandra Palace, which had to be kept darkened to allow the pictures to be seen on monitors, contained a series of apparatus bays at each of which an engineer sat to operate the controls.
![]() To allow each of these engineers to see the monitor screen they sat on stools of graduated heights. |
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The Life and Works of Alan Dower Blumlein by Robert Charles Alexander, |