=Field magnets=, 247 =Field, Marshall=, reference to, 273 =Field spider=, electrical, def., 253 =Fire-engine=, historical reference, 35 =Fire-pumps=, electric drive for, ills. and des., 273 national standard specification for the manufacture of, 351 steam to be started once a week, 377 underwriter, 344 uniform requirements for the underwriter’s steam, 350 =Flange packing=, hydraulic, ills. and des., 154 =Flanges=, table of standard sizes for underwriter pump, 381 =Flax, plaited=, recommended for packing power pumps, 230 =Flow=, def., 22 of water result of gravity, 89 under pressure, 3 cases of, 105 =Fluid condition of matter=, 73 =Fluids, aeriform=, des., 15 data relating to, 77-84 division into liquids and vapors or gases, 73 elastic, two classes of, 73 friction of, des., 99 =Flume=, def., 22 for water wheel, size of, 138 water, how to construct, 138 =Flutter-wheels=, des., 121 =Foot valve and strainer=, ills. and des., 223 =Force pumps=, classification of, 187 two-cylinder, 192 when invented, 53 =Formula= for obtaining the efficiency of hydraulic rams, 177 =Foster steam pump=, ills. and des., 292-294 =Foundations= for hand pumps, des., 204 =Fourneyron’s turbine=, historical note, 128 =Francis Weir table formula=, 122 =Frictional Electricity=, 244 resistance of water, three laws of, 100 =Friction and viscosity of fluids=, def., 99 sliding, def., 100 two kinds of, 99 =Fulcrum= of the lever of a hand pump, 195 =Fusee windlass=, historical note, 62 =Gaining and losing buckets=, historical, des. and ills., 59-60 =Gang pumps=, triplex power, ills. and des., 231 =Garner, Maj. Abram B.=, dedication of work to, V =Gas a condition= or state of matter def., 73 =Gaseous condition of matter=, 73 =Gases=, permanent, des., 73 =Gas pumps=, why so called, 187 =Gate valve=, des., 22 of the underwriter pump, how marked, 389 =Gate-wheel= of turbine water wheel, ills., 139 =Gauge=, pressure, for the underwriter pump, 382 =Gauges, hydraulic=, des. and ills., 115 =Generator=, electric, def., 247 four-pole, des. and ills., 251 =Gland=, def., 22 and stuffing-box, ills. and des., 211 =Glass=, specific gravity of, 96 =Globe valve=, def., 22 =Glossary of pump and hydraulic terms=, 17-34 =Gold=, specific gravity of, 96 =Goose neck=, def., 22 =Gould triplex single acting power pump=, ills. and des., 236, 237 =Gourd=, ills., 35, 38 =Granite=, specific gravity of, 96 =Gravitation=, important note, 88 universal, 85 =Gravity=, law of, 85 influence in weight of water, note, 80 specific, 91 =Gridiron valve=, def., 23 =“Guides” of water wheels=, des., 131 =Guild and Garrison steam pump=, ills. and des., 307-308 =Gutter, double=, des. and ills., 54 =Gyle and gyle-tun=, def., also note, 157 =Gypsum=, specific gravity of, 96