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 Torment of a Flower The Torment of a Flower The Torment of a Flower (), also known as Rainy Night Flower, is a Taiwanese Hokkien song composed by Teng Yu-hsien (; 1906 - 1944) and written by Chou Tien-wang (). A Taiwanese writer Liau Han-sin (廖漢臣) wrote the lyrics of a children's song ""Spring"" (春天) and gave it to Teng Yu-hsien to ask him to compose for it, it's the earliest version of "The Torment of a Flower." Although Teng is a Hakkan, he usually composed with Taiwanese Hokkien but not Hakkan. It is worth noting that some scholars have questioned this story about