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
She Has a Name She Has a Name She Has a Name is a play about human trafficking written by Andrew Kooman in 2009 as a single act and expanded to full length in 2010. It is about the trafficking of children into sexual slavery and was inspired by the deaths of 54 people in the Ranong human-trafficking incident. Kooman had previously published literature, but this was his first full-length play. The stage premiere of "She Has a Name" was directed by Stephen Waldschmidt in Calgary, Alberta in February 2011. From May to October 2012, "She Has a Name" toured across Canada. In conjunction