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 educate Canadians about human trafficking and motivate them to act on what they learn, thereby turning them into anti-sexual slavery activists. "She Has a Name" received strong endorsement from Canadian activists, including MP Joy Smith, Ratanak International's Brian McConaghy, and IJM Canada's Jamie McIntosh. The play's premiere and initial run were critically acclaimed. In the 2012 tour across Canada, "She Has a Name" was performed in several fringe theatre festivals, at which critics representing the "Montreal Gazette", the "Winnipeg Free Press", and CFEQ-FM said it stood out for its quality and moral content. "She Has a Name" was the first