Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 276
t itsapex, and will not cut the coneunless it be exceedingly small.A very small diaphragm aper-ture is objectionable, as it isliable to introduce diffrac-tional effects. Therefore it is FlG> 190 _z,iss s Iris diaphragm,better to use a larger aper-ture further away from the stage than a pin-hole… … 248 ACCESSORY APPARATUS which have been much in use lately both here and on the Continent,,are a mistake.1 A very good way of cutting down a cone from a mirror is to havethe diaphragm fitted so that it can be made to advance or recedefrom the object. The advantage thus gained is that one aperture…
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