This treatise is in two books, dedicated to Dositheus, and deals with the dimensions of spheres, cones, "solid rhombi" and cylinders, all demonstrated in a strictly geometrical method.
9), (3y is a single rod consisting of two cylinders accurately fitting in the ends of the micrometer box, the larger cylinder being at (.
A spiral spring, coiled round the cylinder y, resting one end on the shoulder formed by the difference of the diameters of the cylinders (3 and -y and the other on the inside of the web-frame, presses the latter continuously towards y.
This corresponds, in the Cape instrument, with an excess of the diameters of the holes over those of the cylinders of about i,*mth of an inch - a quantity so small as to imply good workmanship, though it involves a systematic error which is very much larger than the probable error of a single determination of the coincidence point.
Cylinders, tanks and independent boilers should be encased in a non-conducting material such as silicate cotton, thick felt or asbestos composition.
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