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
A Poke in the Eye (With a Sharp Stick) A Poke in the Eye (With a Sharp Stick) A Poke in the Eye (With a Sharp Stick) is the title of the first show in what later became the iconic "Secret Policeman's Ball" series of benefit shows for human rights organization Amnesty International, although it pre-dated by three years the first show to bear that name.. The film of the show was titled "Pleasure At Her Majesty's" which is sometimes mistakenly thought to be the title of the actual benefit show. The landmark 1976 show starring the Monty Python, Beyond The Fringe and The Goodies teams and other top