Modern photography in theory and practice : a hand book for the amateur (1899)
Abbott, Henry G., 1858-1905 · Chicago : Geo. K. Hazlitt · leaf 24
MODERN PHOTOGRAPHY. of the bellows will be seen the two milled nuts which operate the mechanism. On the front board will be seen the lens, shutter and diaphragm and in order to examine and understand their workings see the en- larged vdew at Fig. 4. Ordinarily the diaphragm con- sists of a circular… … riety, one half is located in front and the other half in the rear of the lens tube, leaving room for both the diaphragm and shutter between the front and back combinations, In the illustration the diaphragm is opened to a 16 stop and the shutter is also open. The circular plate above the lens is…
Photography
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-973-623.webp)
