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.

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達志影像

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