![](http://www.alamy.com/thumbs/6/4C1AA152-7D17-4301-914E-1B01A0000D80/K8P5KK.jpg)
Lessons with demonstration of the air pump, Unterricht mit Vorführung der Luftpumpe, 1750, digital improved reproduction of a woodcut, published in the 19th century
Size: 1788px × 3368px
Location: world
Photo credit: © Sunny Celeste / Alamy / Afripics
License: Royalty Free
Model Released: No
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