THE SMALLEST WORKERS
The relative size of atoms and electrons, p. 148—What is electricity? p. 149—Franklin's one-fluid theory, p. 150—Modern views, p. 153—Cathode rays and the X-ray, p. 156—How electricity is developed, p. 159—The work of the dynamical current, p. 162—Theories of electrical action, p. 165—Practical uses of electricity, p. 168.
CHAPTER IX
MAN'S NEWEST CO-LABORER: THE DYNAMO
The mechanism of the dynamo, p. 173—The origin of the dynamo, p. 176—The work of Ampère, Henry, and Faraday, p. 177—Perfecting the dynamo, p. 178—A mysterious mechanism, p. 180—Curious relation between magnetism and electricity as exemplified in the dynamo, p. 182.
CHAPTER X
NIAGARA IN HARNESS
The volume of water at the falls, p. 184—The point at which the falls are "harnessed," p. 185—Within the power-house, p. 186—Penstocks and turbines, p. 188—A miraculous transformation of energy, p. 189—Subterranean tail-races, p. 191—The effect on the falls, p. 192—The transmission of power, p. 194—"Step-up" and "step-down" transformers, p. 198.
CHAPTER XI
THE BANISHMENT OF NIGHT