Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 276
Fig. 105.—Dr. Pantocseks finder. tures graduated as to size. Secondly, a series of separate small discsof metal, with a single central aperture, which fits in a suitablecarrier. Thirdly, there is what is known as the Iris diaphragm,which, in its new form, made with sixteen shutters, has been…
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