Humphrey Potter, in charge of opening and closing the valves of Thomas Newcomen's machine, made it work without assistance by properly placing ropes and butees in order to open and close the valvesFrench School |
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Undated · Engraving
· Picture ID: 1047063
engraving · black and white · physical · england · knowledge · engraving · discovery · english · history · british · invention · brittany · instrument · great · british · 18 18th 18th 18th xviii 18th century · bianchetticor · english · Private Collection / Bridgeman Images |
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