(E) Bring the positively charged E C slowly near the carbon, and note the result.
(F) Slowly bring the negatively charged E S near the carbon that has been charged by contact with F C.
211. Discussion. This experiment showed that while the ebonite was negatively charged, the flannel was positively charged. One kind of electrification is never produced without the other. It can also be shown that the two kinds are equal in amount.
EXPERIMENT 97. To show "successive sparks."
Apparatus. [Fig. 59]. The electrophorus ([Exp. 68]); the extra ebonite sheet, E S (No. 27); three coins (marked A, B, C, in [Fig. 59]). The coins should nearly touch each other, and rest upon E S. A part, only, of the electrophorus cover is shown.
212. Directions. (A) Thoroughly charge the electrophorus cover.
(B) Place your finger upon the coin marked A, to "ground" it, then quickly touch the coin C with the charged cover, at the same time watching for sparks between the coins. If you cannot see the sparks, darken the room a little, and look at the center coin, B, while doing the experiment.
