Joseph-Michel Montgolfier and his brother Jacques-Étienne
owned a paper mill in Voiron and developed the first manned untethered flight of a hot-air balloon.
The balloon was made of paper. Joseph-Michel invented the first self-acting water ram
to raise water at their paper mill.
Early water rams cycled every minute or so, producing a loud thump with each cycle.
See also in The book of science:
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