A mechanical analog calculator (Geomac) has been developed that can be used for rotation programs in such fields as structural petrology, mineralogy, and paleomagnetism. The device consists of a group of concentric circles and arcs on which the problem is reconstructed, and the solution is found. In terms of precision, speed, and ease of operation, the calculator is thought to be superior o t stereographic solutions and preferable to digital computer programs for problems involving a small number of data.

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