Medieval Vacuum

Given a Medieval or Middle Ages level of technology - leather bellows, etc how close could craftsmen come to achieving a near total vacuum in an enclosed space.

In context, I'm trying to create a Medieval society capable of producing chemicals through vacuum distillation, ceramic foams through vacuum kilns and the other benefits vacuums bring to high temperature applications.

If possible - any maths on how close they could get to hard vacuum - or even an approximation of the vacuum level within Magdeburg hemispheres - would also be appreciated.

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Medieval Vacuum

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