Design
Essentially similar in construction to an ordinary CRT, the monoscope contained a formed metal target in place of the phosphor coating at its "screen" end and as the electron beam scanned the target, a varying electrical signal was produced.
This signal reproduced an accurate image of the target and so could be used to produce test patterns and the like. For example, the classic Indian Head test card shown on the right was often produced using a monoscope.
Read more about this topic: Monoscope
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