. The microscope and its revelations. pinion head. The speed of the object at thecentre of the stage is about halfthat of the rack, because theobject is placed about halfwaybetween the rack on the right andthe pivot on the left hand side ofthe stage. The stage is concentric withsimple non-mechanical rotation: itcan be clamped in any desired po-sition by a small screw at the sideof the stage (not shown in thefigure). We may now describe the ex-ceedingly simple, and as we thinkbeautiful because essentially prac-tical, fine adjustment invented byReichert, which we believe willprove itself the mos
. The microscope and its revelations. pinion head. The speed of the object at thecentre of the stage is about halfthat of the rack, because theobject is placed about halfwaybetween the rack on the right andthe pivot on the left hand side ofthe stage. The stage is concentric withsimple non-mechanical rotation: itcan be clamped in any desired po-sition by a small screw at the sideof the stage (not shown in thefigure). We may now describe the ex-ceedingly simple, and as we thinkbeautiful because essentially prac-tical, fine adjustment invented byReichert, which we believe willprove itself the most useful andconservative adjunct ever devisedto make the Continental stand of service for high-class work with-out increasing its expense or ieducing its value in ordinary consists in adapting in a very ingenious manner a lever of thesecond order to the usual direct acting screw. It will be seen l>\fig. 131, which represents this part of the microscope open at Band closed as in use at A. The micrometer screw presses on two. FIG. 188.—Swifts patent tint- a(1881 . 172 T1IK H1STOKY .\ND DEVELOPMENT UF THE MICEOSCOPE levers, h. li. which in turn press the arched piece with its appendix fon 1u tin prism support. The principal screw has three threadsto the imllemeTer. which by the lever> is reduced by about onethird. The pointer for reading the micrometer scale on themilled head is conveniently arranged so that it can be changed to anyiLiire on the ><-ale. The speed of the adjustment is ., }Tlth inch toone rter model, and one of the steadiest and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
