Photochart of polar stars, 1888

Photochart of polar stars, 1888

C024/9978 Rights Managed

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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 1 to 5 minutes (silver bromide prints) and 25 to 45 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 negative prints, see image C024/9977.

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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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