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As I noted in Part I, the general idea of using heat and steam for mechanical work had a long and continuous history back to ancient times. But when we talk of the breakthrough “steam engine” in the eighteenth-century sense, we don’t mean a machine that exploits steam’s expansive, or pushing force. We actually mean a machine that does the exact opposite, exploiting the apparent sucking power that occurs when hot steam is rapidly condensed with a spray of cold water. It’s the relative weight of the atmosphere, compared to the sudden vacuum from condensing steam, that does all the work.

United kingdomAl iskandariyahClaus zittelCornelis drebbelIstitutoe museoEvangelista torricelliFrancis baconThomas tymmeFederico commandino urbinoVera kellerBennet woodcroft taylorConstantijn huygensHeronis alexandrini spiritaliumMorrisr cohenLibavius thelesmosMarianna borrelli