Part 2

V. The Electric Motor 43

VI. Applications of the Electro-magnet 57

VII. Electric Heating 97

VIII. Applications of Electric Heating 107

IX. Lighting a Summer Camp by Electricity 160

X. How Electricity Feels 168

XI. The Electric Sparking Equipment for a Gasolene Engine 178

XII. Electricity From Central Stations 204

XIII. Electricity From an Old Mill 218

XIV. Doing Chores by Electricity 240

XV. Electric currents from Chemical Action and Chemical Action from Electric Currents 248

XVI. Electrocution at Millville 271

XVII. The Telephone 274

XVIII. Electric Bell Outfit for the Cottage 296

XIX. Using Electricity to Aid the Memory 300

XX. The Electric Brick Oven 305

XXI. Electric Waves 309

XXII. Ringing Bells and Lighting Lamps by Electric Waves 324

XXIII. Telegraphing by Electric Waves 329

XXIV. Halley's Comet and Electric Waves 333

XXV. How the Idea of a Universal Ether Developed 339

XXVI. Electric Currents Cannot Be Confined to Wires 349

XXVII. Wireless Telegraphy In Earnest 355

ILLUSTRATIONS

Harold Sending the C. Q. D. Message Frontispiece

FACING PAGE

Testing a Generator 8

Wiring 16