, a person who makes or performs calculations.—It is also the name given by Mr. Ferguson to a machine in the shape of an orrery, which he constructed for exhibiting the motions of the earth and moon, and resolving a variety of astronomical problems. See his Astron. 4to pa. 265, or 8vo pa. 393.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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