. The microscope and its revelations. FIG. 105.—Hertels microscope (1710). 138 THE HISTOIJY AND DEVELOPMENT OF THE MICEOSCOPE scopical construction \\ere here ciiil>iidled. (1) A fine-adjustmentscrew !• i- connected with the sliding socket E, supporting the arm\>. in \\hich ilit- body-tube is screwed; the focussing could thus becontrolled in ,-i far mure effective manner than by any system pre-viously applied to ,-i l;irgc microscope-. The previous systems involvedthe direct movement of the hody-tube either by rotating in a screw-socket (a> in Hooke>) or 1 iv sliding in a cylindric
. The microscope and its revelations. FIG. 105.—Hertels microscope (1710). 138 THE HISTOIJY AND DEVELOPMENT OF THE MICEOSCOPE scopical construction \\ere here ciiil>iidled. (1) A fine-adjustmentscrew !• i- connected with the sliding socket E, supporting the arm\>. in \\hich ilit- body-tube is screwed; the focussing could thus becontrolled in ,-i far mure effective manner than by any system pre-viously applied to ,-i l;irgc microscope-. The previous systems involvedthe direct movement of the hody-tube either by rotating in a screw-socket (a> in Hooke>) or 1 iv sliding in a cylindrical socket (as inDivinis and Cherubins); in a few instances the object was moved. • i;- M. Joblots inicni -r,.p(. (1718 lation to the objed lens, but all these plans were more or less vrith microscopes of large dimensions. Marshalls 1|H mechanica] improvement, for the object could luring the actual process of focussing, as the ima<-e «Klj in the field. (2) A fork. X X. is here applied lamp, 0, on the pillar itself. (3) Hookes ball- ww applied to the arm I. is here shifted to ; Pillar, where i, would give the movements of microscope instead of to the body tub,- only, DE. LIEBEEKUHNS MICROSCOPE 139 as in Hookes; the ball L could be tightly clamped by the screwcollar M, in which slots were cut to give spring. (4) A condensinglens on jointed arms appears ; this probably was the first applicationof such adjustments to the con-denser. From the singular posi-tion of the candle beneath thecondenser, we may infer, withoutdoubt, that the mirror was stillunknown as a microscopical ac-cessory in England. In fact, in no microscope up
Size: 1300px × 1923px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
