Dancing Naked on the Head of a Pin: The Early History of Microphotography
To produce microphotographs en masse, Dagron used a long wooden box that contained, at one end, a glass negative of the image to be reduced. At the other end was the reducing camera with up to twenty-five small lenses and the sensitized plate. When the end with the negative was held to a light source, the image was projected into the lenses and onto the sensitized glass plate to create multiple positive transparencies, each measuring about two millimeters square. Dagron employed the Taupenot dry