Valve seats, water, construction of, 37 Valve springs, 35 Valve, steam slide, 14 Valves, steam slide adjustment, 15 Valve stems, types required, 38 Valves, sticking of water valves, 36 Valve, suction valve area, 33 Water cylinders, 27 Workmanship, character of, 1 Yoke, 10 INDEX TO PART ONE _Any one, and more especially the attentive student, can with the least trouble avail himself of the subject matter contained in this work by doing as indicated in the following old English couplet quoted by Chas. Reade._ “_=For index-reading turns no student pale, Yet takes the eel of science by the tail.=_” THE INDEX TO PART ONE OF ROGERS PUMPS AND HYDRAULICS. PAGE =Accumulator=, an, des., 151 hydraulic, ills. and des., 171-173 rule for calculating capacity of, 172 =Acid, muriatic=, specific gravity of, 96 sulphuric, specific gravity of, 96 =Adjustment of the slide valves= of the underwriter steam fire pumps, 360 =Advantages of a duplex pump= as a fire pump, 351 =Aëriform fluids=, des., 15 =Air=, des., composition of, 15, 16 and vacuum chambers for the underwriter pump, 381 Practically the reverse of each other, 221 =Air-bound=, def., 17 =Air chamber of pump=, ills., 223 chambers, ills. and des., 220 =Air-cock=, def., 17 =Air=, gravity and elasticity of, 16 =Air pump=, 13 and electric motor, ills. and des., 271 valve, marking of, for the underwriter pump, 385 =Alcohol=, specific gravity of, 96 =Alcometer=, def., 94 =Allen, Frank=, annotations, IV, VIII =Alternating motor=, des. and ills., 252 =Ammeters=, des. and ills., 256 =Ampere=, def., 256 =Angle for crank positions of duplex, triplex and quadruplex pumps=, 230 of check valve, ills. and des., 227 =Animal power=, 187 =Animals=, when drinking are natural bellows pumps, Note, 199 =Annular valve=, def., 17 =Antimony=, specific gravity of, 96 =Apparatus, hydraulic=, def., 157 =Archimedes and the hydrostatic balance=, 93 =Area=, def., 17 =Armature=, des. and ills., 247, 251 =Armored pump valves=, ills. and des., 217 =Armstrong, Sir William=, designer of the hydraulic accumulator, 171 =Arsenic=, specific gravity of, 96 =Asphalt, melted=, raised by pumps, 188 =Assembling=, def., 17 =Atmospheric electricity=, 245 pressure, def., 17 =Attraction=, capillary, def., 103 of gravitation, 85 =Auxiliary=, def., 17 =Bag pump=, ills. and des., 198 =Balanced valve=, def., 18 =Ball check-valve=, def., 18 =Barrel= or cylinder of a pump, des., 189 ills., 195 =Base= of hand pump, ills., 195 =Basket=, def., 18 =Battery=, how indicated by the signs + and -, 261 =Bellows-pump=, illustrated and des., 186, 198, 199 =Belted pumps=, des. and ills., 225 =Belt-pumps=, hydraulic, 200 pumps, why so called, 187 =Bends=, def., 18 =Bethesda, pool of=, historical def., 49