. The microscope and its revelations. FIG. 395.—Object-holder for analysis by diversified section. ( hi tlic circumference of B a spiral is cut. which slightKvisible at (j ; into this spiral a screw passes at H. which is turned bythe milled head S, which can alter the position of the arc to thehorizontal to the extent of 1 mm. ; and the amount of the change ofposition can be read off on the graduated circle K. In a fixed position the middle of this section-holder is the planeof action of the knife. If an object be fixed in the jaws so that the. PIG. ::.H>.—Cylinder for use with jaw
. The microscope and its revelations. FIG. 395.—Object-holder for analysis by diversified section. ( hi tlic circumference of B a spiral is cut. which slightKvisible at (j ; into this spiral a screw passes at H. which is turned bythe milled head S, which can alter the position of the arc to thehorizontal to the extent of 1 mm. ; and the amount of the change ofposition can be read off on the graduated circle K. In a fixed position the middle of this section-holder is the planeof action of the knife. If an object be fixed in the jaws so that the. PIG. ::.H>.—Cylinder for use with jaws. fixed axis of it lies in this plane, it will only be required that thescrew S be lii-onght into action to obtain wedge-shaped sections ofwhatever thickness is required, which will all be made in this axis. The set of cylinders which may be used with these and otherjaw- i> represented in tig. :!(.)(j: by is the cylinder, CJ the compressingscrew for it. the block W being held in the jaws. Tin- oljid */;//,• ii-i(li //.s- n-micr may be sliddeu up the incline by THE THOMA MICEOTOME 467 hand; but it is much more accurate to control its movement withthe micrometer-screw. The point of this screw in fig. 392, t, work*on the polished plane of an agate cone. The clamp on which thescrew is mounted is held firmly in its place by the milled head \V inSc/i. It may stretch up as far as O, being refastened by W. The screw m is so cut that a single rotation moves the slide onthe ,•;,,! mm., which in the inclination of the plane of ] : 20 givesan elev
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
