204 . . . . . . . PAGE PAGE . . . . 263 Synchronous Polyphase Motors .... 147 Tapering Conductors ........ 31 Target Diagram for Incandesceut Lamps . . 417 Temperature Coefficient of Copper .... 6 Three-brush Dynamo ......... 76 Three-phase Currents ......... 143 Three-wire and Five-wire Systems ... 70-92 Three-nire System, Auxiliary Generator . 78 Bridge arrangement of ... · · · · 74 . 120 with Three-brush Dynamo .... of A. C. distribution .... Transfer Bus bars ....... . . . 65 Transformers ........ .. . 149 . 150 . 163 Constant current .... . . 171 Construction of ... Cooling of ...... . . 167 . . 153 Copper Losses . .... . Cores . . . . . . . .. 157 . Efficiency of . ... 159 Hedgehog .. ·.· · · · · Magnetic Leakage in ... . . 95 . . . . 158 21 Polyphase ........ . . . . 184 Potential. ........ ... 182 Protective Devices for .... . . . . 174 . 163 ..... Regulation in 4 Step-up and Step-down .. . . 149 Testing . 180 . . . . . . . Variable-ratio . . . . . . . . . 196 Size and Location of ... Two-phase Currents . . . . . . . . Two- and Three-phase Motors ...... Underground Conductors ... Cables for . . . . . . . . 147 Drawing in... · · · · · · Earthenware Conduits for . . . . . . 269 Edison Tube System of ..... in Iron Pipes ........ Manholes for .......... Methods of Distribution ... . Wooden Conduits for ...... Vacuum in Incandescent Lamps ... 401 : 20 Voltage, Limitations of .... 255 Wattless Current .......... 159 of Distribution .......18 Waves, Fundamental and Harmonic ... 112 ... 135 Wire Table ........ .. ter . . . . . . . . . . 378 . 392 Wooden Moulding : ....... . . 243 . . 75 LUI. LIST OF WORKS ELECTRICAL SCIENCE. PUBLISHED AND FOR SALE BY D. VAN NOSTRAND COMPANY, 23 Murray and 27 Warren Streets, New York. ABBOTT, A. V. The Electrical Transmission of Energy. A Manual for the Design of Electrical Circuits. Third Edition, revised. Illustratioris and 9 folding plates. 8vo, cloth. $4.50. ARNOLD, E. 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