Or two different tapping utensils - wrench and finger, for example.
It isn't optimal and it would be harder to interpret, but there are many ways of differentiating between patterns of sound without being able to alter the length of the sound being made. It might not strictly be Morse code, but it could, in theory, work, and basing it on Morse is as sensible as basing it on anything else...
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It isn't optimal and it would be harder to interpret, but there are many ways of differentiating between patterns of sound without being able to alter the length of the sound being made. It might not strictly be Morse code, but it could, in theory, work, and basing it on Morse is as sensible as basing it on anything else...