Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 218
ntscrew, if the motion is slow, the threadmust be fine. Hence in forms wherethe fine adjustment is made to lift thebody, the differential screw is of greatvalue. Fig. 148 illustrates this admirable instrument. It has a truetripod foot of the Powell and Lealand type, a plain horse-shoe stagewith a… … Fig. 147.—Centring nose-pieceused as sub-stage.
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