Frames /sing


Spinoza: Two Grinding Lathes roughly from the Period


A simple, hand-turned lathe (1614):

Taken from the Middleburg 400 year anniversary page

Johannes Hevelius

foot-powered Lathe (Selenographia, sive Lunae descriptio, 1647)

taken from the Galleo Telescope page from the I & M of the History of Science

Perhaps Spinoza’s grinding lathe had a construction something along this principle.

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