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Old telegraph
By changing the position of the arms in succession, a message could be sent over a distance, the message could be relayed by a system of telegraph towers.
From: Louis Thomas, Kosmos für die Jugend: Die Denkwürdigsten Erfindungen Im neunzehnten Jahrhundert (1877)
From: Louis Thomas, Kosmos für die Jugend: Die Denkwürdigsten Erfindungen Im neunzehnten Jahrhundert (1877)
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