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Show THE PHENOMENON OF CENTRI- FUGAL FORCE. i A German paper describes the Interesting In-teresting phenomenon of centrifugal force which Is the power of revolving bodies, even of soft material, to cut through groat thicknesses of tho hardest of armor plate and which is recognized as a rotary tension. The rotation of a wheel keeps tho wheelman or bicyclist, without exertion, exer-tion, free on his seat, i. c, tho so called call-ed free axis. Wc can also observe It easily in a top, which, its equlll-brulm equlll-brulm distributed, as long as tho rotation ro-tation Is rapid enough, always resumes re-sumes a certain position In regard to its axis, without requiring pivot bearings. bear-ings. Rotation also exercises a tendon-producing effect on the substance of a revolving body, and it is this tension ten-sion that imparts to the soft saws referred re-ferred to their notable efficiency. If, for instance, a disk of tain cardboard is caused, by a suitable transmission, to rotate very rapidly on the lathe the rotatory tension causes tho card to behave like sheet metal. The cardboard can. In such ca?e, no longer be bent, and if struck with a hammer, gives off a sound ns though we were striking bronze. This is, however, only the beginning. If we place on the shaft of the electro motor a disk of good paper, cut into anv exact circle cir-cle of eight Inches diameter, this paper pa-per disk can be made at the highest rotating speed of the motor to saw through cigar box wood. At tho ci ting surface it acquires a fine brown polish. We can fit on ihe shaft of the rotatory ro-tatory apparatus a drum, about which may be passed an annular closed little lit-tle chain in such a manner that at the highest rotatory speed of which the motor is capable it can be slipped ofT the drum. The chain will then behave like a solid ring, roll across the table, and when it strikes the ground bounce up like a hoop. |