Steam engine · the energy source converted into mechanical motion

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Your new ahaThe energy of steam.

A steam engine converts thermal energy into mechanical work. Source: Steam engine ↗

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14Electrical telegraph · the form in which messages travelledRECALL
Encoded messages as electrical signals.
It changed communication by making information travel much faster than a person or horse.
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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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