Lecture

 1 I  | therefore, is to draw a line, A B, corresponding with the
 2 II |       intensely upon this disc, B, C, D, and this light acts
 3 II |         from this little screen B F (merely a square piece
 4 II |       at the size of the shadow B D - it is four times the
 5 II |       one, and that distance, A B is two, but that size E
 6 II |     size E being one, this size B D of shadow is four instead
 7 II |       hold this screen here, at B F, a certain amount of light
 8 II |        the part of this screen, B D, now in shadow; moreover,
 9 II |       take this piece of glass, B [a prism], you see it will
10 III|    colored liquid in the vessel B. And I dare say you know
11 III|   volume of steam of that size, B [1,700 cubic inches; nearly
12 III| connected with the wires (A and B) coming outside, and I want
13 III|   metallic connection (at A and B), you see the water boiling
14 III|     wires of the battery (at A, B), I shall get a similar
15 III|      comes from the other side (B), and I think we shall soon
16 V  |         touching the conductor (B) with his finger, the lecturer