. The microscope and its revelations. FIG. 373.—Zeisss cover-glass Fit;. 374.—Mr. J. Ciceri Smiths direct-reading micrometer. until the required adjustment is obtained, the exact measurement indecimal parts of an inch being at the same instant automatically andaccurately recorded on the index, these readings responding in eitherdirection with the most delicate movements of the screw. To avoid the screw being unduly strained, the spindle is rotatedby friction from the outer spring-tight thimble, the inner thimblebeing rigidly fixed to the spindle. Hence it is impossible to strainthe sc
. The microscope and its revelations. FIG. 373.—Zeisss cover-glass Fit;. 374.—Mr. J. Ciceri Smiths direct-reading micrometer. until the required adjustment is obtained, the exact measurement indecimal parts of an inch being at the same instant automatically andaccurately recorded on the index, these readings responding in eitherdirection with the most delicate movements of the screw. To avoid the screw being unduly strained, the spindle is rotatedby friction from the outer spring-tight thimble, the inner thimblebeing rigidly fixed to the spindle. Hence it is impossible to strainthe screw, since as soon as the pressure becomes too great the spring 442 PREPARATION, MOUNTING, AND COLLECTION OF OBJECTS allows the outer thimble to slip. The connection of the spimlle tothe measuring wheels is effected by means of a stop. This takesinto a slot on a sleeve, on which is mounted the thousandths wheel,which in turn drives the huiidredths and tenths wheels through theintermediate pinions. These latter have a step-by-step motion, asin an ordinary counter. The c
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
