Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 259
mm. (vi) -0254 mm. : 05 mm. :: 4*257 : x screw value ;•05 x 4-257 r0254 8*38 screw value for *05 mm. A A cheap substitute for the screw-micrometer has been devised byMr. G. Jackson. It consists in having a transparent arbitrary scaleinserted into an ordinary Huyghenian eye-piece in the focus of the… … B value of -xqYu) inch ormm., as the case JijUliAdLiLtikii may be, is found interms of the arbitraryscale. The value ofthe object in terms ofthe same scale is alsofound, and compari-son made accord-ingly. All that need be done is to substitute the terms of the arbitrary scale for screwvalues m the…
Microscopy
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