upon the arc of 90° whichit encloses, and the line B, the direction of the force and (beingof the same length) also its amount. This force, B, will be heldin equilibrium by the two forces represented by the lines C andD, each of which is equal to the radius. Now take any other portion of the… … Ihe amount of force exerted upon each of these planes willevidently be in proportion to its length; any two of these ities draw also the two tangents, T T. From the intersectionof the tangent lines, mark off the line, C, equal to the lengthof the chord. B, and this line will represent the direction…
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