For clearness of illustration, I have shown, as above stated, but two sets of expansion coils, but there is no limit to the number that may be used. Assuming that we have an apparatus with four expansion coils, each knife-bar holding 50 balance levers, giving a total of 200 levers, with expansion strips of the same number, in 5-foot lengths, we would have a total of 1,000 linear feet of zinc strips, which entire length of strips will, on the slightest change of temperature, get longer or shorter. The expansion and contracting of this 1,000 feet of zinc strips for every temperature change of 5 degrees Fahr. will be 1 inch. Now, assuming that the knife-bars are pulled upward by heavy strips O^{8}, O^{9}, and sheets O^{10}, O^{11} of five feet length (making ten feet for the front and rear strips and sheets), on a decrease in temperature of 5 degrees Fahr. the upward movement of those bars will be 10-1000 of one inch; this contraction (10-1000) will now be multiplied as many times as there are levers and strips in the expansion coils, viz., 200 times, which would be 2 inches, and this, together with 1 inch from the contraction of the expansion coils alone, will give a total movement of 3 inches. If the strips are of a capacity to pull or lift 100 pounds, we obtain a lift of 100 pounds 3 inches. As thirty-three per cent approximately must be deducted for loss by stress (it being necessary to place the coils under strain, as shown in the drawings and described above), the final result will be a power to lift 100 pounds 2 inches, or 10 pounds 20 inches, and this force will be sufficient to run a large sized time clock with powerful striking force. As illustrated in Figs. 4, 5, 6 and 7, the power applied by the springs M^{9}, M^{10} to the power transmission shaft M¹ is taken, through the spur wheel M² by means of any suitable gearing, to run a clock or any other machine adapted to the purpose. As there illustrated, I show the spur wheel M² meshing with a pinion P, through which is driven the spur wheel P¹, which latter meshes with a pinion P², through which is driven a sprocket wheel P³ carried by the bracket P^{4}, which latter, as well as the shafts carrying said spur wheels and pinions, are supported by an upright P^{5} mounted upon the casing M. The sprocket wheel P³ carries a sprocket chain P^{6}, which, through any suitable gearing, is adapted to wind the main spring of a clock indicated at Q, carried by suitable supports on the cross-bar Q¹ secured to the uprights C, C¹. As this clock may be of any well known form, it will not be necessary to describe the same in detail, except to state that as soon as the main spring of the clock becomes weaker than the springs of the power-storage device illustrated in Fig. 7, the latter will wind the clock main spring, and as in this manner it is wound frequently, it is always kept at a uniform high tension, which is desirable and results in good time-keeping.