810 INDEX 



PAGE 



Heating of power-house 175 



High frequency 596 



High-frequency absorbers 602 



History of hydraulic and electrical developments 1 



Hook gauge 61 



Hydraulic gradient 119 



Hydraulic radius 106, 117 



Hydro-electric systems, data 783 



references to descriptions 757 



Hydrograph records 66 



Hydrology 39 



I 



Ice 103 



Ice guards 71 



Illumination of power-house 174, 538 



Impedance, cables 642 



effect of parallel operation of transformers 425 



natural 597 



synchronous 292 



transformer 426 



Indicators, frequency 543 



power factor 542 



synchronous 544 



temperature , 545 



transformer cooling water 435 



Inductance 467 



Insulation, generator 325, 330 



transformer 439 



wires and cables 625 



Insulators, bus-bar 569 



Instruments 538 



ammeters 540, 541 



connections 551 



current and potential transformers 546 



curve-drawing 541, 546 



electrostatic ground detectors 545 



frequency indicators 543 



indicating wattmeters 542 



power-factor indicators 542 



reactive volt-ampere indicators 543 



synchronism indicators 544 



temperature indicators 545 



voltmeters 540, 541* 



watthour meters 549 



Intakes, water 100, 163 



Interconnected systems 698 



