Scientific & Medical AntiquesOld Technology & Books |
Fountain In VacuoFor demonstrating that the air pressure in the flask will squirt the water out of the nozzle when it is placed in a vacuum. The flask is placed under a vacuum pump jar, which is evacuated, air in the flask expands forcing the water out of the nozzle, making a fountain.Height 15cm approx.Late 18th early 19th C
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