Lecture

 1 II|  each other inversely as the square of the distance - a sad
 2 II|      meaning of the "inverse square of the distance."~I have
 3 II|  little screen B F (merely a square piece of card), which, as
 4 II|     then, comes the "inverse square of the distance." This distance,
 5 II| instead of two, which is the square of the distance, and, if
 6 II|  meant by the inverse of the square of the distance. This screen
 7 II| expression, inversely as the square of the distance. Now if
 8 II| exactly in proportion to the square of the distance you are
 9 II|     attract according to the square of the distance, inversely.
10 II|    That bar of iron one inch square has such power of attraction
11 II| plate-glass about two inches square]. (I shall want this afterward
12 II|   with a hammer]; there is a square prism which I may break
13 II|  which I may break up into a square cube. You see these fragments
14 II|      these fragments are all square; one side may be longer
15 II|  only split up so as to form square or oblong pieces with cubical