. The steam-engine and other heat-motors . supply has been diminished for the following stroke. It is desirable that governors approach, but not arrive, at iso-chronism, since oversensitiveness practically produces more irregu-larity in the motion of an engine than that arising from a pre-determined variation from perfect uniformity of rotation. There are other methods of obtaining isochronal motion. iV2/i = 2936f 1 +«)• For any given governor the only variables in the above fundamental equation are N and h. If the governoris so constructed that h is constant for different radii of action ofth
. The steam-engine and other heat-motors . supply has been diminished for the following stroke. It is desirable that governors approach, but not arrive, at iso-chronism, since oversensitiveness practically produces more irregu-larity in the motion of an engine than that arising from a pre-determined variation from perfect uniformity of rotation. There are other methods of obtaining isochronal motion. iV2/i = 2936f 1 +«)• For any given governor the only variables in the above fundamental equation are N and h. If the governoris so constructed that h is constant for different radii of action ofthe balls, then N becomes constant also. For example, three dif-ferent simple pendulum-governors having the same cone height ACybut the lever-arms of different lengths as shown, would all revolvein the same time, for, in that case, iV2/i = 2936. Hence if in a REVOLUTION CONTROL. 337 governor the arm AB could lengthen out as shown, the motionwould be isochronous. A practical method of obtaining the above motion quite ap- \\\ \ \ \ \ \ N \. 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 circle.
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