Part

 1 I  |   work produced. But both the arm of the blacksmith who delivers
 2 I  |       muscles of the arms. An arm the muscles of which are
 3 I  |      the effects of the human arm and those of machines. The
 4 I  |     it lasts, the more is the arm tired, and the more is the
 5 I  |    this capacity of the human arm of being tired is only one
 6 I  |      in the case of the human arm.~From the feeling of exertion
 7 I  |     clock by the power of the arm, by which the weight is
 8 I  |    moving force - that of the arm - its activity can be restored.~
 9 I  |       by the power of our own arm; it would in that case be
10 I  |      the direct action of the arm. In the clock we use a weight
11 I  |     by the power of the human arm or by means of some other
12 I  |   appreciable exertion of the arm, may be set in motion. The
13 I  |  lever, supported at "c", the arm"c b" being four times as
14 I  |    times as long as the other arm "a c". Let a weight of one
15 I  | weight nor the pressure of my arm is quite sufficient to drive
16 II |      the height A a. Hence my arm must exert a certain force
17 II |       height A a, to which my arm had previously raised it.
18 II |       Thus the work which the arm originally imparted to the
19 II |      consume the force of the arm; this has to overcome the
20 II |        To stretch the cord my arm must work for a few seconds;
21 II |     the entire work which the arm had communicated in the
22 II |     work is produced which my arm did not originally impart
23 II |    without having to exert my arm. This is possible and is
24 II |     have gained work which my arm has not performed. Something,
25 III|   resistance, it supports the arm of the observer which does
26 III|       mechanical force of the arm which turns the wheel produces