Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . and Magnetic Induction, 198 XIV. Variation of Current Pressure and Resistance, .... 235 XV. Current Carrying Capacity of Copper Wires, ..... 266 XVI. Temperature Coefficients, 272 XVII. Gauges of Different Wires Fused by 100 Amperes, . 273 XVIII. Induction Currents, 303 XIX. Sparking Distances in Air, 321 XX. Spark Coil Dimensions, 323 XXI. Insulation Test, 359 XXII. Motor Test, 401 XXIII. Definition of Practical Electrical Units, 445 XXIV. Equivalents of Units of Length, 446 XXV. Eq
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . and Magnetic Induction, 198 XIV. Variation of Current Pressure and Resistance, .... 235 XV. Current Carrying Capacity of Copper Wires, ..... 266 XVI. Temperature Coefficients, 272 XVII. Gauges of Different Wires Fused by 100 Amperes, . 273 XVIII. Induction Currents, 303 XIX. Sparking Distances in Air, 321 XX. Spark Coil Dimensions, 323 XXI. Insulation Test, 359 XXII. Motor Test, 401 XXIII. Definition of Practical Electrical Units, 445 XXIV. Equivalents of Units of Length, 446 XXV. Equivalents of Units of Area, 447 XXVI. Equivalents of Units of Volume, 447 XXVII. Equivalents of Units of Weight, 448 XXVIII. Equivalents of Units of Energy and Work, 449 XXIX. Comparative Table of Gauges, 450 XXX. Decimal Equivalents, . . 451 XXXI. Volts Loss on Copper Wire, 451 XXXII. Useful Equivalents of Electrical Heating, 452 APPENDIX. PAGE Summary of Formulae, 436 Mensuration Formula?, 443 Tables XXIII to XXXII, 445 Instruction Plates (2), Cover pocket. LESSONS IN PRACTICAL ELECTRICITY. LESSON Fig. 1.—Natural Magnet At-tracting Iron Filings. MAGNETISM. Natural Magnets—Artificial Magnets—Definition of a Magnet—ThePoles—Magnetic Attraction and Eepulsion—Two Kinds of Mag-netic Force—The two Poles Inseparable—Magnetic Substances—Magnetisable Metals—Classification of Magnets—Questions. 1. Natural Magnets.—The name magnet was first appliedby the ancients to brown-colored stones, known as magneticoxide of iron (Fe3OJ because these, as taken from the earth,possessed the peculiar property ofattracting small pieces of iron orsteel. Later the Chinese discoveredthat if a piece of the ore were freelysuspended by a string it possessedthe important property of pointingalways in a particular direction,nearly north and south ; hence theygave it the name of lodestone (mean-ing leading stone), and used it in this manner to navi-gate their ships. Excellent iron is
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