Jesse Ramsden, English Instrument Maker

Jesse Ramsden (October 6, 1735 - November 5, 1800) was an English mathematician, astronomical and scientific instrument maker. The quality and accuracy of his instruments established his reputation as the most able instrument maker in Europe. He created one of the first high-quality dividing engines. He published a Description of an Engine for dividing Mathematical Instruments in 1777. Ramsden was the first to carry out in practice a method of reading off angles by measuring the distance of the index from the nearest division line by means of a micrometer screw which moves one or two fine threads placed in the focus of a microscope

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Calculating Dividing Generator Math Ramsden

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