Photochart of polar stars, 1888

Photochart of polar stars, 1888

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Caption: Photochart of polar stars. 19th-century series of photographs for a region of the northern polar skies, showing some 1270 stars. Three types of photographic prints are shown here: silver bromide prints (exposed using gaslight), platinotype prints (exposed using diffused sunlight), and a photozincograph. The exposure times range from 20 to 60 seconds (silver bromide prints) and 3 to 30 minutes (platinotype prints). Two circular (polar projection) engravings are also shown. The observations were carried out by on 14 August 1888 by British amateur astronomer and engineer Isaac Roberts (1829-1904). For transparencies, see image C024/9978.

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Keywords: 14 august 1888, 1800s, 1888, 19th century, astronomical, astronomy, astrophysical, astrophysics, black-and-white, british, diffused sunlight, english, engravings, european, exposure times, gaslight, historical, history, isaac roberts, monochrome, night sky, no-one, nobody, northern hemisphere, northern polar skies, photochart, photographic negative, photozincograph, platinotype prints, polar projection, polar region, polar stars, silver bromide prints, sky, star, star chart

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