Sparkingchip:
Voice pipes could be used over distances as long as 300 feet (90 m).
Wikipedia- Speaking tube.
Interesting as a resident of the borough to read of the "Gosport Tube", but I would still say that if you stuff the tube full of cables, it will not transmit sound. Nonetheless, a chum of mine who is a professor in Nottingham, once made the very valid point that if you do not know the answer, you have to do an experiment; which is exactly why I suggested the buzzer.
Please don't over-think this one.
Sparkingchip:
Voice pipes could be used over distances as long as 300 feet (90 m).
Wikipedia- Speaking tube.
Interesting as a resident of the borough to read of the "Gosport Tube", but I would still say that if you stuff the tube full of cables, it will not transmit sound. Nonetheless, a chum of mine who is a professor in Nottingham, once made the very valid point that if you do not know the answer, you have to do an experiment; which is exactly why I suggested the buzzer.
Please don't over-think this one.
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