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Abney, William de Wiveleslie

Born: 1843 AD
Died: 1920 AD
Nationality: English
Categories: Astronomers, Chemists, Photographers

1843 – Born on the 24th of July in Derby, England.

1861 – He attended the Royal Military Academy and joined the Royal Engineers.
       – He was a pioneer of several technical aspects of photography.
       – He became a chemical assistant at the Chatham School of Military Engineering.

1874 – He developed a dry photographic emulsion, which replaced "wet" emulsions.

       – He used this emulsion in an Egyptian expedition to photograph the transit
           of Venus across the sun.

1880 – He introduced hydroquinone.

1882 – He introduced new and useful types of photographic paper, including a formula for
           gelatin silver chloride paper.

1887 – He was also a pioneer in photographing the infrared solar spectrum, as well as researching
           sunlight in the medium of the atmosphere.

       – He invented the "Abney Level", a combined clinometer and Spirit level , used by surveyors
           to measure slopes and angles.

1920 – He died on the 3rd of December in Folkestone, England.