Dynamo, the, 126; alternating current, 130; commutator of, 129; compound wound, 131; direct current, 130; lamps connected to, 132; series wound, 131; shunt wound, 131; used as motor, 161; use of in central stations, 170; used with water power, 170. Dynamos, electricity generated by, Chap. XVII.; types of, 130; various machines, 132; winding of, 131. Dynamotors, 137. Earth, inductive influence of, 43; lines of force about, 40, 42. Ebonite, electricity by friction upon, 3, 4. Edison-Lelande cells, 59. Electric, automobiles, 169; bell, and some of its uses, Chap. XV.; boats, 168; buzzers, 118; cars, 164; conduits, 140; fans, 162; flat-irons, 146; gas lighters, 174; griddles, 147; kitchen, 147; lights, arc, Chap. XXII.; lights, incandescent, Chap. XXI.; machines, static, 7 to 13; machines, uses of, 14; motor, the, 161; motor, and how it does work, Chap. XXIV.; soldering irons, 146; telegraph, and how it sends messages, Chap. XIV.; telephone, and how it transmits speech, Chap. XVI.; welding, 146. Electric current, and work, 133; and chemical action, 81; chemical effects of, Chap. VII.; how distributed for use, Chap. XIX.; magnetic effects of, Chap. XI.; how transformed, Chap. XVIII. Electrical, connections, 60; horse-power, 77; measurements, Chap. VI.; resistance, 68; resistance, unit of, 69; units, Chap. VI. Electricity, about frictional, Chap. I.; and chemical action, 81; atmospheric, 18; heat produced by, Chap. XX.; history of, 3; how generated upon cat, 1; how generated by dynamos, Chap. XVII.; how generated by heat, Chap. X.; how generated by induction, Chap. XII.; how generated by voltaic cell, Chap. III.; origin of name, 2. Electrification, kinds of, 6; laws of, 7. Electrolysis, 79. Electrolyte, 79. Electromagnetic induction, 99. Electromagnetism, 91. Electromagnets, 96; forms of, 97. Electro-mechanical gong, 116. Electromotive force, defined, 65, 71; measurement of, 67; of polarization, 85; of static electricity, 17; unit of, 66. Electrophorus, the, 8. Electroplating, 82. Electroscopes, 5. Electrotyping, 83. Experiments, early, with currents, 44; some simple, 1. External resistance, 68. Fan motors, 162. Field, magnetic, 37. Field-magnets, 129. Figures, magnetic, 38. Filaments, carbon, 149; bamboo, etc., 149. Fire, St. Elmo's, 22. Flat-irons, electric, 147. Floor mains, 139. Fluoroscope, 158.