Part

 1 I  |        height of fall. Hence, we may take the product of the
 2 I  |          a foot can produce.1~We may apply this measure of work
 3 I  |        to still lower levels, it may be used to work other wheels.
 4 I  |        answer an objection which may readily suggest itself.
 5 I  |       aid of which heavy burdens may be lifted by a comparatively
 6 I  |        ship to the quay. Now, it may be asked, If a large, heavy
 7 I  | appreciable exertion of the arm, may be set in motion. The weight
 8 I  |          fixed parts of machines may be regarded as modified
 9 II |          that of a moving mass - may merge into one another.
10 II |         oscillations provided we may leave out of consideration
11 II |       measurement, the apparatus may be arranged more simply.
12 II |          intelligent human force may be spared for better purposes;
13 II |          so hot, indeed, that it may take fire; machine wheels
14 II |      axles going at a great rate may become so hot that they
15 III|         certain quantity of heat may be changed into a definite
16 III|         which a quantity of work may appear.~These facts no longer
17 III|        of the two substances.~We may regard this force as an
18 III|   mechanical forces, or heat.~We may express this generally.
19 III|           We have seen that heat may be changed into work; there
20 III|       entirely different methods may be discovered for each of
21 III|       equivalent in work of heat may be found. The equivalent
22 III|         the other natural forces may be expressed in terms of
23 III|     natural forces working force may indeed disappear in one