Polygon of Forces
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“In the apparatus shown... three forces act on a small body and are allowed to assume a position of equilibrium. A triangle is then constructed with sides parallel respectively to the three forces; it will be found by measurement that the sides are also the lengths proportional to the forces, and as will be seen the arrowheads point concurrently round the triangle.
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General PhysicsSource
Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)
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