Product images of Eyepiece micrometer
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This is a parallel wire distance eyepiece micrometer which is a type of filar micrometer. It would probably have been used to measure the distance between stars or between nebulae, star clusters and stars by the maker's older brother, William Herschel.
Johann Alexander Herschel
- Image reference: F3349
- National Maritime Museum, Greenwich, London, Herschel Collection