Gascoigne’s_micrometer_as_drawn_by_Robert_Hooke

Robert Hooke – A Description of an Instrument for Dividing a Foot into Many Thousand Parts, and Thereby Measuring the Diameters of Planets to a Great Exactness, &c. as It Was Promised, Numb. 25. In: Philosophical Transactions. Band 2, Nummer 29, 11.
Source: Wikimedia Commons

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