INDEX 813 



PAGE 



Pipe lines, size 120 



steel pipe 125 



thickness of plates 125, 126 



wooden-stave pipe 131 



Pitot tube 797 



Polarity of transformers 421 



Pondage 159 



Population of United States 14 



Potential transformers 546, 565, 638 



Power, cost 742 



development 654, 675, 684 



market 655, 677 



primary and secondary 683 



Power factor, effect on generator operation 284 



effect of reactance 462 



Power factor indicator 542 



Power-house 165 



arrangemet of apparatus T 175 



basement 166 



cranes 171 



doors 171 



floors 170 



foundations 168 



general design 165 



heating 175 



illumination 174 



roof 170 



typical layouts 180 



ventilation 173 



windows 171 



Power systems, load factor '. 682 



peak loads 682 



yearly output 682 



Power transmission, development 4, 10 



Precipitation. See Rainfall 44 



Pressure, atmospheric 42 



pipe line 122, 126, 138 



regulation 246 



regulators. See Relief valves 258 



Primary power ' 683 



Primary power in United States 24 



Q 



Quantity of flowing water 67, 795 



R 



Racks 100 



Rack cleaners 101, 147 



