=Plate, capacity=, of underwriter steam fire pump, 355 =Platinum=, specific gravity of, 96 =Plug-valve=, def., 26 =Plumb-bob=, def., 26 =Plunger of a pump=, how indicated in Fig. 181 and succeeding ills., 209 of hand pump, ills., 195 pumps, single acting, ills. of two, 228, 229 =Plungers=, proportion of water and steam, advised by the Underwriters Associat’n, 352, 353 water, of the underwriter steam fire pump, 368 =Pneumatics=, 15 def., 74 hydro, 15 =“Points” for erecting and operating hand pumps=, 204 =Pole-piece=, laminated, def. and ills., 254 =Pole-pieces=, part of dynamo, 247 =Poplar=, specific gravity of, 96 =Porcelain=, specific gravity of, 96 =Positive electricity=, 245 =Pots=, chain of, des. and ills., 63 =Power or steam ends of pumps=, 211 =Power pump=, double acting (4 check valves), 227 duplex, ills. and des., 230, 231 classification of, 187, 207 =Power transmission by water pressure engines=, 145 =Preface=, II =Press=, hydraulic, des. and ills., 169, 170 =Pressure gauge= for the underwriter pump, 382 necessary to produce a magnetic current, 242 of electric currents, how measured, 256 of water, table of, 114 reducing valve, def., 27 =Priming=, def., 27 arrangement, des., 390 pipe of pump connections, 223 place for the underwriter pump, ills. and des., 387 =Prizometer or pressure guage=, def., 115 =Properties of steam=, explanation, 281-285 =Pulley and bucket=, historical des. and ills., 46, 48 and windlass, historical, des., 60, 61 =Pulling-jack=, hydraulic, des. and ills., 161, 163 =Pump and combined horse power= apparatus, 201 bag, ills. and des., 198 bellows, ills. and des., 186, 198, 199 =Pump-box=, def., 27 =Pump-brake=, def., 27 =Pump, Buffalo single cylinder=, ills. and des., 319-321 =Pump, Burnham steam=, ills. and des., 324-326 =Pump-chain=, def., 27 =Pump-cheeks=, def., 27 =Pump, conditions of service= required of a, 224 =Pump, Dean Bros.=, ills. and des., 326-328 =Deane single acting triplex power pump=, ills. and des., 234, 235 Deane steam, ills. and des., 317-319 double acting low service, belt driven, 227 duplex, ills. and des., 331-398 duplex, outside packed plunger pattern for high pressure, 341 duplex power, ills. and des., 230 duplex steam, explanation, 333 electric, direct driven motor, ills. and des., 272-273 electric induction motor, ills. and des., 276 electric mining, ills. and des., 274-276 Gould single acting triplex power pump, ills. and des., 236, 237 =Pump, Guild and Garrison steam=, ills. and des., 307-308 hand rotary force, ills. and des., 197 hydraulic belt, 200 =Pumping engine=, historical reference, 36 =Pumping machinery, electric=, 267-276