The Instructograph was a paper tape-based machine used for the study of Morse code. == Overview == The paper tape mechanism consisted of two reels which passed a paper tape across a reading device that actuated a set of contacts which changed state dependent on the presence or absence of hole punches in the tape.
The Instructograph was a paper tape-based machine used for the study of Morse code. == Overview == The paper tape mechanism consisted of two reels which passed a paper tape across a reading device that actuated a set of contacts which changed state dependent on the presence or absence of hole punches in the tape.
Source: Wikipedia "Instructograph" · CC BY-SA 4.0
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