STATICAL ELECTRICITY.—MAGNETISM.—STATICAL ELECTRICITY.
Lessons 25–27.
General phenomena. Distinction of bodies into conductors and non-conductors. Distinction of electricity into two kinds. Separation of the two electricities by friction. Hypothesis of electric fluids. Effects of vacuum of gases and vapors of points. Electrical attractions and repulsions. Electrization by influence. Case where the influenced body is already electrized. Sparks; power of points. Electrization by influence preceding the motion of light bodies.
Electroscopes.
Electrical machines of Van-Marum, Nairne, Armstrong.
Condenser. Accumulation of electricity upon its surface. Leyden jar. Batteries. Electrical discharges. Effects of electricity.
Condensing electroscope. Electrophorus.
Velocity of statical electricity.
Atmospherical electricity. Phenomena observed with a serene sky. Electricity of clouds. Storms. Lightning. Thunder. Effects of thunder. Return-shock. Lightning conductor.
Different sources of statical electricity.