450 



INDEX 



Flasks, 439-446 

 Flexure, 234 235 

 Flues, 322 

 Foot-pound, 24 

 Force, 23 



bending, 237 . 



centrifugal, 59-61 



centripetal, 60 



effects of load of, on body, 233 



electro-magnetic, 170 



parallelogram of, 62 

 Friction, 



ball bearings, 50 



effect of, 49 



measurement of, 50 

 Frictional electricity (See "Elec- 

 tricity, frictional ") 

 Fuse, 201 



Galvanometer, 178 



used in measuring heat, 182 

 Gas, 



engines, 359-368 (See also "Gas 

 engines") 



for heating, 347 



lighting, 118 



manufactured, 118 



natural, 118 

 Gas engines, 359-368 



operation of, 361 



principles of, 359 



types of, 360 

 Gases, 



air, properties of, 90 



barometer, 88 



Boyle's Law, 93 



expansion of, 87 



noxious, 356 



properties of, 86-98 



use in industry, 86 

 Gassing, 164 

 Gauges, 



marking, 429 



water, 313 

 Gear-box, 366 

 Gears, 29 1-300 



direction of, 296 



object of, 291 



parts identified, 297-299 



principle of, 291-293 



ratio of, 296 



ratio of measurements, 299 



relation of speed to diameter, 

 295 



teeth of, 294 



terms defined, 297-299 



types of, 293 



Generation of steam (See "Steam") 

 Geology, 1, 2 

 Glass, 159 

 Gouges, 428 

 Governor, 330, 365 

 Gravitation, 55 

 Gravity, 



acceleration of, 56 



cell, 175 



specific, 80 

 Graining, 379 

 Grinding stones, 278-28.1 



artificial development of, 280 



corundum wheels, 279 



development of, 278 



emery wheels, 279 

 Grindstones, used for wood-work- 

 ing tools, 425 

 Gunpowder, 159 



H 



Hammers, 262 

 Hand-tools, 262-282 

 chisels, 263-266 

 drills, 27 1-274 

 files, 266-270 

 hammers, 262 

 scrapers, 270 

 wood- working, 417-431 



brace and bit, 426 



care of, 425 



chisels, 423, 428 



gauges, 429 



knife, 424 



plane, 427 



saws, 417-423 



squares, 429 

 Heart-wood, 390 

 Heat, 99-1 12 



boiling point, 106 

 B. T. U., 103 

 generation of, 99 

 latent, 104 



