monoscopen.
/ˈmɒnə(ʊ)skəʊp/, U.S. /ˈmɑnəˌskoʊp/ Television. Now historical.
An experimental television camera tube for generating a video signal corresponding to a test picture or pattern enclosed within the tube.
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1938 C. E. Burnett in RCA Rev. 2 414 ‘Monoscope’ is the name which has been given to a developmental type of tube designed to produce a video signal of a test picture or pattern enclosed in the tube. Since the picture must be enclosed in the tube, the Monoscope is not suitable for developing a video signal which represents action.
1953 S. W. Amos & D. C. Birkinshaw Television Engin. I. iv. 79 A monoscope is a camera tube containing a target on which a pattern or photograph is printed and which, by scanning the target, generates a picture signal corresponding to the printed image.
1955 G. M. Glasford Fund. Television Engin. xv. 480 A useful device for generating a video test signal is the monoscope.
1979 Television 29 520/1 At one time the monoscope was one of the most popular methods of generating a test card signal.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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n.1938