Dark-field micrometer, 19th century

Dark-field micrometer, 19th century

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Caption: Dark-field micrometer, 19th century. This device was designed and built by British-Australian astronomer Robert Lewis John Ellery (1827-1908) for the equatorial telescope of the Melbourne Observatory. It was described in a paper published in 1884. Micrometers are precision measuring instruments used to help measure the position of stars and other objects observed through a telescope or recorded on a photographic record of a telescope observation.

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Keywords: 1800s, 19th century, astrometry, astronomical, astronomy, astrophotography, astrophysical, astrophysics, australian, black-and-white, british, dark field, dark-field micrometer, device, ellery, english, equipment, historical, history, instrument, measurement, melbourne observatory, micrometre, monochrome, no-one, nobody, precision measurements, robert lewis john ellery, stellar cartography, technological, technology

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