. The microscope and its revelations. eaning them, andreplacing them, when they should worksmoothly and without shake. Wherethe sliding parts are tightened intoeasilv fitting and merely ploughedgrooves by pressing the pinion into therack, the desirable result of smoothworking and instant responsiveness ofsliding plates to milled heads will notpresent itself. l>ut besides the perfect action of the sliding parts, a perfectmechanical stage should have equal speed of motion vertical!/ «mlhorizontally. A common fault is that the speed ot the rack workgiving vertical motion is greatly in excess o
. The microscope and its revelations. eaning them, andreplacing them, when they should worksmoothly and without shake. Wherethe sliding parts are tightened intoeasilv fitting and merely ploughedgrooves by pressing the pinion into therack, the desirable result of smoothworking and instant responsiveness ofsliding plates to milled heads will notpresent itself. l>ut besides the perfect action of the sliding parts, a perfectmechanical stage should have equal speed of motion vertical!/ «mlhorizontally. A common fault is that the speed ot the rack workgiving vertical motion is greatly in excess of that of the screw givinglateral or horizontal motion. If, for example, a pinion has eightleaves, arid the rack it works has twenty-four teeth to the inch, thenthree turns of the milled head (and pinion) would cause one inch ofmovement to the stage, in order, therefore, to get the same rate ofmovement in the lateral motion, the screw should be so pitched asonly to move the stage through an inch with three revolutions of theed FIG. 137 (18!)Hj. in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
