Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 193
In very well 168 THE HISTORY AND EVOLUTION OF THE MICROSCOPE made instruments the pinion engages the rack so lightly that thisrapid motion may easily be given to it. In others the pinion canbe disengaged and rapid movement effected. The centre of rotation of the stage should be closely… … Fig. 12H a.—Zeisss mechanical stage. and is found in some high-class instruments ; hut t his is not needful,for all that is really required is to rotate an objed without losing?t. In fact exact centring would have to be readjusted for everyseparate objective if it were needed. Bui any Blight…
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