Chapter XII. Plotting Mechanical Motions

To find how much motion an eccentric will give to its rod

To find how much a given amount of motion of a long arm will move the short arm of a lever

Example of the end of a lever acting directly on a shoe; a short arm having a roller acting upon a larger roller

A link introduced in the place of the roller to find the amount of motion of the rod; a lever actuating a plunger in a vertical line, to find how much a given amount of motion of the long arm will actuate the plunger

Two levers upon their axles or shafts, the arms connected by a link and one arm connected to a rod

A lever arm and cam in one piece on a shaft, a shoe sliding on the line, and held against the cam face by the rod, to find the position of the face of the shoe against the cam

To find the amount of motion imparted in a straight line to a rod, attached to an eccentric strap

Examples in drawing the cut off cams employed instead of eccentrics on river steamboats in the Western and Southern States. Different views of a pair of cams

The object of using a cam instead of an eccentric

Method of drawing or marking out a full stroke cam

Part played by the stroke of the engine in determining the conformation of cut-off cams; manner of finding essential points of drawings of cutoff cams

A cam designed to cut off the steam at five-eighths of the piston stroke

Three-fourths and seven-eighths cams

Necessary imperfections in the operations of cut-off cams

Drawing representing the motion which a crank imparts to a connecting rod

Plotting out the motion of a shaper link quick return

Plotting out the Whitworth quick return motion employed in machines

Finding the curves for moulding cutters