Electrical telegraph · the form in which messages travelled

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HistoryOne small aha

Your new ahaEncoded messages as electrical signals.

Telegraphy sends messages across distance using coded signals. Source: Telegraphy ↗

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15This dot-and-dash encoding system became closely associated with electrical telegraphy.RECALL
Morse code.
It represents letters and numbers with dots and dashes.
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16Semaphore telegraph · the visible signals used to convey messagesRECALL
Visible positions of arms or flags.
It was an optical network used before electric telegraph systems became widespread.
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17Ada Lovelace's Analytical Engine notes · the calculation described in her famous algorithmRECALL
A method for calculating Bernoulli numbers.
Her notes also described how a general-purpose machine could work with symbols beyond arithmetic.
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