. The steam-engine and other heat-motors . Fig. 173. Fig. 174. proximately is found by crossing the arms of the governor-ballsand making use of auxiliary arms, so that the balls in ascendingdescribe an approximate parabola instead of the Fig. 175. On the axis XXf of Fig. 122 lay off a parabola as the ordinates BB and erect the normals BS and BSi,Draw a parallel ordinate BiBx and erect normals as before to 338 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. intersect the other normals in some points S and Si. It is a prop-erty of the parabola that the subnormal ac = bd. The cone hei
. The steam-engine and other heat-motors . Fig. 173. Fig. 174. proximately is found by crossing the arms of the governor-ballsand making use of auxiliary arms, so that the balls in ascendingdescribe an approximate parabola instead of the Fig. 175. On the axis XXf of Fig. 122 lay off a parabola as the ordinates BB and erect the normals BS and BSi,Draw a parallel ordinate BiBx and erect normals as before to 338 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. intersect the other normals in some points S and Si. It is a prop-erty of the parabola that the subnormal ac = bd. The cone heightbeing constant, a governor operating on these lines would be iso-chronal. A practical form of this governor is shown in Fig. 175. Bychoosing the points Si, S so that the subnormal slightly increases,a stable governor is obtained; if, however, the subnormal decreases,the governor would be unstable. Power of a Governor.—There is a certain amount of work donein raising the weights of a governor, which is given out again onthe descent of the weights. This work is called the power of thegovernor and is equal to the two vertical forces that are necessary toraise the weights multiplied by the range of elevation in feet, ortwice the mean cen
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