[Answer] 8. What was a 'test pattern'?

Step 1 : Introduction to the question "8. What was a 'test pattern'?"

...1. School survey 2. An indicator that the television was on and tuned 3. Atom bomb study 4. Hearing test In the early days of American television, networks only broadcast for a select few hours a day. Instead of "snow" being seen on an off-the-air station, many broadcast a test pattern, often resembling a target or a design and often accompanied by an annoying droning sound. It could be used to adjust the camera. Probably the most famous American black and white test pattern was the so-called "Indian Head" monoscope pattern. This pattern was originated by RCA in 1939.

Step 2 : Answer to the question "8. What was a 'test pattern'?"

An indicator that the television was on and tuned:

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