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
Auckland Flower Show event. Although the organisers planned to follow up with another show, it has not eventuated. Auckland Flower Show The Auckland Flower Show was a flower and garden show held in Alexandra Park in the suburb of Epsom, Auckland in November 2008. Previously, the Ellerslie Flower Show was held at the same time of year in Auckland, and had been held every year since 1994 (except 1997). In November 2007, the organisers sold the name of the Ellerslie Flower Show and the use of their services to the Christchurch City Council, which intends holding future Ellerslie Flower Shows at Hagley Park