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
Daisy (given name) Daisy (given name) Daisy is a feminine given name, commonly thought to be derived from the name of the flower. The flower name comes from the Old English word "dægeseage", meaning "day's eye". The name Daisy is therefore ultimately derived from this source. Daisy is also a nickname for Margaret, used because "Marguerite", the French version of that name, is also a French name for the oxeye daisy. It came into popular use in the late Victorian era along with other flower names. Authors Linda Rosenkrantz and Pamela Redmond Satran wrote in their 2007 book "Baby Name Bible" that Daisy