Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 191
hich their value isreduced to its lowestin actual work. We have pointedout in Chapter IV.that the stage plates >f a mechanical stageshould be suitablygraduated to Jtun-dn dths of <tn inch asn \ftitdir, and theprinciple on whichthey should be con-structed and cmI»lo\ ed is given under that… … Fig. 128.—The Tolles mechanical stage adoptedby Boss. but capable of being replaced with absolute precision as <<> position. The aperture in the stage should always be large, at least twoinches in diameter. There ought always to be space enough abovethe ordinary slip when it is in position…
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