Sunday, 31 January 2021

Letter sent from William Gascoigne to William Crabtree in 1641

 

Letter sent from William Gascoigne to William Crabtree


January 25th 1641


William Gascoigne wrote a lengthy letter to his friend William Crabtree of Salford talking about his rudimentary micrometer and a telescopic sight. He also gave advice on how to illuminate the ‘hairs’ suggesting that he was already using the device.



This is the first reference to a micrometer being made and then tested.

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