Part

 1 I |      first toothed wheel of the clock, cannot obey the pull of
 2 I |       the weight cannot put the clock in motion without itself
 3 I |     move, it could not move the clock, and its motion can only
 4 I |       of gravity. Hence, if the clock is to go, the weight must
 5 I |     supports it is run out. The clock then stops. The usual effect
 6 I |          But we can wind up the clock by the power of the arm,
 7 I | capacity, and can again set the clock in motion.~We learn from
 8 I |       to perform in driving the clock is not indeed great. It
 9 I |     weight is detached from the clock, the pendulum swings for
10 I |   mentioned. Hence, to keep the clock going, there must be a moving
11 I |      work. Let us assume that a clock is driven by a weight of
12 I |         runs down ten feet, the clock will go two days instead
13 I |       action of the arm. In the clock we use a weight so that
14 I |     directly. By winding up the clock we accumulate a store of
15 II|        coiled in winding up the clock, and are uncoiled by the
16 II|  uncoiled by the working of the clock. To coil up the spring we
17 II|      wind it up, just as in the clock we have to overcome the
18 II|    operation of stretching; the clock, on the contrary, spreads