such a pump was invested by von G verick in Germany during 1650. he uded it for producing vacuum and demonstrating the effects of atmospheres presses as which the magdevurg is gemispheres the pump consist of a metalic cylindrical barrel in which a piston can se moved in and out by mend of a piston provided with handle there is a valve v1 at the battom of the cylindrical barrel and another valve v2 in the piston.
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