Part

 1 I  | intellectual influence on the last four centuries, have so profoundly,
 2 I  |         gained. Let us assume that four labourers have to raise
 3 I  |            have to raise a load of four hundredweight by means of
 4 I  |        rope is pulled down through four feet, the load is also raised
 5 I  |        load is also raised through four feet. But now, for the sake
 6 I  |            load hung to a block of four pulleys. A single labourer
 7 I  |           force as each one of the four put forth. But when he pulls
 8 I  |          he pulls the rope through four feet, the load only rises
 9 I  |      distributed in the block over four ropes, so that each of these
10 I  |          man must necessarily work four times as long as the four
11 I  |          four times as long as the four together did. But the total
12 I  |          work is the same, whether four labourers work for a quarter
13 I  |      weight will have sunk through four times the distance that
14 I  |         fall of 100 pounds through four feet is just as much 400
15 I  |             c", the arm"c b" being four times as long as the other
16 I  |            at "b", and a weight of four pounds at "a", the lever
17 I  |          which the heavy weight of four pounds has been raised,
18 I  |     lighter one has fallen through four inches; and four pounds
19 I  |           through four inches; and four pounds through one inch
20 I  |       product of one pound through four inches.~Most other fixed
21 III|          given weight of hydrogen, four times as much heat as in
22 III|      galvanic battery. Each of the four vessels contains nitric