Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message.
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A steam engine is a heat engine that performs mechanical work using steam as…
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invented by Alois Senefelder
Lithography (from Ancient Greek λίθος, lithos ‘stone’, and…
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invented by Richard Salter
A scale or balance is a device to measure weight or mass. These are also known…
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invented by John hadley Thomas godfrey
The octant, also called reflecting quadrant, is a measuring instrument used…
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