ISBN: 1142566900 / ISBN-13: 9781142566906
Lectures on Select Subjects in Mechanics, Hydrostatics, Hydraulics, Pneumatics, and Optics: With the Use of the Globes, the Art of Dialing, and the Calculation of the Mean Times of New and Full Moons and Eclipses
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from ... Show synopsis This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1823 Excerpt: ...the sheave C, gives the latter a circular alternating motion when the bow is drawn backwards and forwards. 3. A lever, with two arched heads or ends, working in a vertical rack, or raising a weight by means of a chain passing over the arched ends, the weight descending by its own weight, is also a machine which produces the same effect. 4. In Fig. 14, the wheel A B approaches to the point C, by turning it round its axis in one direction, and recedes from it by turning it round in the opposite direction. The ropes A C, B C, being twisted round the axis C D, the distance between A B and C is necessarily shortened, while their untwisting increases that distance. This contrivance is often used for drilling or boring with the extremity D. 5. Another contrivance for the same purpose is shewn in Fig. 15, where the rod a b rises and descends vertically, between the two guides m n, mn, by means of the alternate circular motion of the lever A B moving round the centre C, and connected with a b by the ruler B D, having an axis of motion at each end. 6. The contrivance called the Parallel Motion, invented by Mr. Watt, for giving a circular alternating motion to the beams of his steam-engines, by means of the rectilineal alternating motion of the piston, belongs to this class of machines, and has been described in p. 100 of this volume. CHAPTER V. ON THE NATURE AND OPERATION OF FLY-WHEELS, AND OTHER CONTRIVANCES FOR REGULATING THE MOTION OF MACHINES. Fly wheels FLY 'n mecnanics is a heavy wheel or cylinder which moves rapidly upon its axis, and is applied to machines for the purpose of rendering uniform a desultory or reciprocating motion, arising either from the nature of the machinery, from an inequality in the resistance to be overcome, or from an irregular applicati...
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