Diaphragm (optics) 1889 "Dictionary of Photography" (see figure), but disappeared after Ernst Abbe's theory of stops unified these concepts. According to Rudolf Kingslake, the inventor of the iris diaphragm is unknown. Others credit Joseph Nicéphore Niépce for this device, around 1820. Mr. J. H. Brown, a member of the Royal Microscopical Society, appears to have invented a popular improved iris diaphragm by 1867. Kingslake has more definite histories for some other diaphragm types, such as M. Noton's adjustable "cat eye" diaphragm of two sliding squares in 1856, and the Waterhouse stops of John Waterhouse in 1858. Diaphragm (optics) In optics, a diaphragm
The Stone Flower (1946 film) The Stone Flower (1946 film) The Stone Flower () is a 1946 Soviet fantasy film directed by Aleksandr Ptushko. It is an adaptation of Pavel Bazhov's story of the same name, in turn based on Ural region Russian folklore. It also incorporates plot elements from the stories "The Mistress of the Copper Mountain" and "The Master Craftsman". "The Stone Flower" was theatrically released by Mosfilm on 28 April 1946. It was the Soviet Union's first color film shot on Agfacolor negative film seized in Germany, and was entered into the 1946 Cannes Film Festival. It was a success at the