507 MECHANICAL MOVEMENTS
Preface
The want of a comprehensive collection of illustrations and descriptions of MECHANICAL MOVEMENTS has long been seriously felt by artisans, inventors, and students of the mechanical arts. It was the knowledge of this want which induced the compilation of the collection here presented. The movements which it contains have been already illustrated and described in occasional installments scattered through five volumes of the AMERICAN ARTISAN by the readers of which their publication was received with so much favor as was believed to warrant the expense of their reproduction, with some revision, in a separate volume.
More that one-fourth of the movements – many of purely American origin – have never previously appeared in any published collection. Although the collection embraces about three times as many movements as have ever been contained in any previous American publication, it has not been the object of the compiler to merely swell the number, but he has endeavored to select only such as may be of really practical value; and with this end in view, he has rejected many which are found in nearly all the previously published collections, but which he has considered only applicable to some exceptional want.
Owing to the selection of these movements at such intervals as could be snatched from professional duties which admitted of no postponement, and to the engravings having been made from time to time for immediate publication, the classification of the movements is not as perfect as the compiler could have desired; yet it is believed that this deficiency is more than compensated for by the copiousness of the Index, and the entirely novel arrangement of the illustrations and descriptive letterpress on opposite pages, which make the collection –large and comprehensive as it is – more convenient for reference than any previous one.
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1.
Illustrates the transmission of power by simple pulleys and an open belt. In this case both of the pulleys rotate in the same direction
2.
Differs from 1 in the substitution of a crossed belt for the open one. In this case the direction of rotation of the pulleys is reversed.
By arranging three pulleys, side by side, upon the shaft to be driven, the middle one fast and the other two loose upon it, and using both an open and a crossed belt, the direction of the said shaft is enabled to be reversed without stopping or reversing the driver. One belt will always run on the fast pulley and the other on one of the loose pulleys. The shaft will be driven in one direction or the other, according as the open or crossed belt is on the fast pulley.
3.
A method of transmitting motion from a shaft at right angles to another, by means of guide-pulleys. There are two of these pulleys, side by side, one for each leaf of the belt.
4.
A method of transmitting motion from
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