By Henry T. Brown

This 1868 compendium of inventive mechanisms employs basic drawings to give an explanation for 507 of the small parts that represent complicated equipment. Left-hand pages function illustrations, and dealing with pages supply short descriptions of use and operation. starting from easy to advanced, the mechanisms contain cranks, pulleys, drills, wheels, and screws.

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Used in screw-cutting and slide-lathes. 105. Screw stamping-press. Rectilinear motion from circular motion. 106 and 107. Uniform reciprocating rectilinear motion, produced by rotary motion of grooved cams. 108. Uniform reciprocating rectilinear motion from uniform rotary motion of a cylinder, in which are cut reverse threads or grooves, which necessarily intersect twice in every revolution. A point inserted in the groove will traverse the cylinder from end to end. 109. The rotation of the screw at the left-hand side produces a uniform rectilinear movement of a cutter which cuts another screw thread.

The rod to the right is made to press constantly against the teeth or edge of the rim. On turning the wheel, alternate rectilinear motion is communicated to the rod. The character of this motion may be varied by altering the shape of the teeth or profile of the edge of the rim of the wheel. 137. Expansion eccentric used in France to work the slide-valve of a steam engine. The eccentric is fixed on the crank-shaft, and communicates motion to the forked vibrating arm to the bottom of which the valve-rod is attached.

9. Cone-pulleys for the same purpose as 8. This motion is used in cotton machinery, and in all machines which are required to run with a gradually increased or diminished speed. 10. Is a modification of 9, the pulleys being of different shape. 11. Another method of effecting the same result as 3, without guide-pulleys. 12. Simple pulley used for lifting weights. In this the power must be equal to the weight to obtain equilibrium. 13. In this the lower pulley is movable. One end of the rope being fixed, the other must move twice as fast as the weight, and a corresponding gain of power is consequently effected.

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