Many types of equipment use ball bearings to minimize friction in rotating parts, including automobiles, bicycles, electric appliances, and industrial machinery. Ball bearings are ground to ensure a ...
A DESCRIPTION of a small measuring microscope devised by us may be of interest to readers of NATURE. The optical elements are extremely simple, consisting of a Ramsden eyepiece having a scale, divided ...
UNDER a high power it is extremely troublesome to move the object so that one of its boundaries coincides exactly with a division of the micrometerscale. But when the object is small this very greatly ...
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