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"Two wedges have been placed toward one another underneath the weight. Equal force is applied to each wedge which raises the weight." —Quackenbos 1859

Double Wedge

"Two wedges have been placed toward one another underneath the weight. Equal force is applied to each…

"One of the primary simple mechanical powers. The plane's surface is inclined to the horizon at any angle." —Quackenbos 1859

Inclined Plane

"One of the primary simple mechanical powers. The plane's surface is inclined to the horizon at any…

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos 1859

Inclined Plane Wedge

"This wedge is a movable inclined plane. Allows for raising great weights a short distance." —Quackenbos…