. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ut, producing similarresults, which serve tocheck or prove the com-parisons. It inchides amethod for investigatingthe subdivisions of thestandard by comparingeach part of the totallength with a constant orinvariable quantity or dis-tance. Referring to the illus-trations (Figs. 7, 8, 9), themain features of its con-struction are the follow-ing : A heavy cast-ironbase, A, is mounted uponstone - capped brick piers,givi
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ut, producing similarresults, which serve tocheck or prove the com-parisons. It inchides amethod for investigatingthe subdivisions of thestandard by comparingeach part of the totallength with a constant orinvariable quantity or dis-tance. Referring to the illus-trations (Figs. 7, 8, 9), themain features of its con-struction are the follow-ing : A heavy cast-ironbase, A, is mounted uponstone - capped brick piers,giving a permanent foun-dation to the this base, and reach-ing from end to end, aretwo heavy steel tubes, Band C, 3 in. in diameter, ground perfectly straight, and being true when placed in the cen-ters of a lathe, the object being to get a sti-aight-line motion of the microscope-plate Z>,which slides freely on these true cylinders. Flexure of these cylindrical guides is overcomeby lever-supports at the neutral points n and m. Fitted closely to these guides and outsideof the range of motion of the microscope-plate D are two stops, £ and F, one at each end, as. Fig. 6.—Measuring-machine.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
