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When William Herschel discovered Uranus, who else at the time had a comparable telescope?

William Herschel built a big telescope and observed Uranus in 1781. I'm trying to figure out who else had a comparable telescope at the time, who could verify these observations? Apparently Johan ...
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Why were the first steam engines “atmospheric engines”

Anybody who has boiled water knows that a positive pressure builds up when steam is produced. Indeed the first conceptual design of a steam engine (the Aeolipile) was a "positive pressure" engine. The ...