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crude major a is cylindrical polishing mill

crude major a is cylindrical polishing mill

This technical drawing tells us that the instrument was used to “polish precious stones the fragments of which are wellsuited for medical use” Arnaut 1439 p 136 It doesn’t say much about the laps but luckily in the Codex Latinus Monacensis we learn that “it requires three polishing disks the first is lead the second is tin the third is copper” CLM 197 1430 pg 48

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