Optical micrometers of the 18th century

Optical micrometers of the 18th century.. Optical micrometers including Dr. Nevil Maskelyne's, Mr. Edward Troughton's and Dr. William Herschel's lamp micrometer. Copperplate engraving by Wilson Lowry after a drawing by J. Farey Jr. from Abraham Rees Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1820

Cyclopedia Dictionary Farey Herschels Hurst Longman Lowry Micrometer Nevil Optical Orme Rees

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