By Henry T. Brown
This 1868 compendium of creative mechanisms employs basic drawings to give an explanation for 507 of the small elements that represent advanced equipment. Left-hand pages function illustrations, and dealing with pages provide short descriptions of use and operation. starting from easy to complicated, the mechanisms comprise cranks, pulleys, drills, wheels, and screws.
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Extra info for 507 Mechanical Movements. Mechanisms and Devices
The pinion consists in reality of two cams, which gear with two distinct series of teeth on opposite sides of the wheel, the teeth of one series alternating in position with those of the other. 206. A continuous circular movement of the ratchet-wheel, produced by the vibration of the lever carrying two pawls, one of which engages the ratchet-teeth in rising and the other in falling. 207. A modification of 195 by means of two worms and worm-wheels. 208. A pin-wheel and slotted pinion, by which three changes of speed can be obtained.
By turning the traverse bar an attached pencil is made to describe an ellipse by the rectilinear movement of the studs in the grooves. 153. Circular motion into alternating rectilinear motion. The studs on the rotating disk strike the projection on the under side of the horizontal bar, moving it one direction. The return motion is given by means of the bell-crank or elbow-lever, one arm of which is operated upon by the next stud, and the other strikes the stud on the front of the horizontal bar.
Variable rotary motion produced by uniform rotary motion. The small spur-pinion works in a slot cut in the bar, which turns loosely upon the shaft of the elliptical gear. The bearing of the pinion-shaft has applied to it a spring, which keeps it engaged; the slot in the bar is to allow for the variation of length of radius of the elliptical gear. 36. Mangle-wheel and pinion—so called from their application to mangles—converts continuous rotary motion of pinion into reciprocating rotary motion of wheel.