Cloud study, c 1840.
3 3 c m
actual image size: 32cm x 25cm
© National Media Museum / Science & Society Picture Library


Waxed paper negative by Sir John Herschel (1792-1871). Herschel, an English astronomer, mathematician and chemist, was the son of Sir William Herschel (1738-1822). He introduced 'hypo' (thiosulphate) as a photographic fixative and discovered the cyanotype or blueprint proces in 1842.



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