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Dr. STONE Episode 21 – Spartan Crafts Club
I'm pretty sure this Sprengel vacuum pump wouldn't work, I mean, the purpose of the devise is to compress air between the falling drops of mercury but the width of the tube is large the enough so that the air is not forced to fall with the mercury.
Here is a picture of a true Sprengel vacuum pump:
https://www.youtube.com/watch?v=viJ3T-1KZqY&list=LLeEcKD8da4GH6Rzh5ELJ89A&index=4483
In there you can see the mercury ocuppies the width of the tub and air is forced to go down with the mercury
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