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The following are quotes:
- “The vacuum left by fire lifts a weight.”
- (a) Hooke, Robert. (1675). A Description of Helioscopes and some other Instruments (invention #9: “A New Invention in Mechanics of Prodigious Use: Exceeding the Chimera’s of Perpetual Motions for Several Uses” (cypher), pg. #). Publisher.
(b) Inwood, Stephen. (2003). The Man Who Knew Too Much: the Strange and Inventive Life of Robert Hooke 1653-1703 ("lifts a weight", pg. 198). Pan MacMillan.
- Weight – Wikipedia.