CHAPTER XII.
MISCELLANEOUS EXPERIMENTS.

Fig. 58.

EXPERIMENT 96. To show that friction always produces two kinds of electrifications.

Apparatus. [Fig. 58]. The carbon electroscope ([Exp. 58]); flannel cloth, F C, doubled twice to make 4 thicknesses (see [Fig. 58]); ebonite sheet, E S (No. 26); ebonite rod, E R (No. 28); charged electrophorus cover, E C.

210. Directions. (A) Vigorously rub E S with F C (folded as in [Fig. 58]). See if you can discover any attraction between them.

(B) Rub E S again, but do not lift F C from it with the hand alone. Slip E R under the top fold in F C ([Fig. 58]), and lift F C straight up from E S. Do not let F C touch the table or your hand.

(C) See if F C is charged, using 2 or 3 different tests.

(D) Charge the electroscope with F C until the carbon is strongly repelled.