674 



Index 



water supply Cont'd 



pollution of, 53-54, 59, 459 

 purification of, 53-56, 61, 468, 



(56, 359, 468) 

 relation to sewage disposal, 54, 



59-60, 156 

 sanitary control of, 49, 51, 53, 54, 



465, 467-468, 520 

 sources of, 51-54, 56 

 storage and distribution to 



homes, 48, 51-54, 76 

 systems, 52-56, (55) 

 water trap, 60, (60) 

 water wheels, 18, 50, 71, (72, 73, 



74) 



breast, 72, 73, 618, (73) 

 overshot, 72, 73, 634, (72) 

 Pelton, 73, 75, 634, (73) 

 turbine, 51, 72, 73-75, 224, 644, 



(73,74) 



undershot, 72, 73, 644, (73) 

 Watt, James, 75, 251, 259, 558-559, 



578 



watts, 211, 212, 645 

 waves, 



heat, 180-181, 190 



light, 180, 181-182, 186, 582 



radio, 181, 234-235, 587, (589, 590, 



592) 

 sound, 170, 173, 176, 177, 221-222, 



235-237, 585 

 waxing of moon, 155 

 weather, 118-130, 131-147, 645 

 air pressure, 40, 121, 131 

 bulletins, 143 

 bureau, 121, 126, 135, 141, 142- 



143, 145, 645 

 causes of, 119 

 denned, 118 

 factors, 118, 131 

 graphs, 126, 143, 645 

 humidity, 121-123, 124, 126 

 influence on plants and animals, 



118 



instruments, 39-40, 138-139 

 lore, 140-141 



maps, 126, 143, 144, (144) 

 precipitation, 121-122 

 predictions, 131, 141-143, 145 

 reports, 592 

 signs, 141 

 storm areas, 139-140 



weather Cont'd 



temperature, 121 



thunderstorms, 121, 136 



wind and, 121, 125, 131-147 

 wedge, 243, 250, 645, (250) 

 weeds, 532, 533 



weight, 15, 244-248, 645, (246) 

 weight arm, 244 

 welding, 25, (25) 

 wells, 



artesian, 57-58, 92, 616, (158) 



location of, 53-54, (53) 



oil, 92, 93, (92) 

 westerlies, 134, 645, (133) 

 wet bulb thermometer, 123 

 wheel and axle, 243, 248, 645, (248) 

 wheels, 256 



drive, 18, 260-262, 266 



water, 18, 50, 71-75 

 white corpuscles, 316, 341, 393, 416- 

 417, 424, 455, 473, 645, (316, 

 341) 



white matter, 431, 432, 646 

 Whitney, Eli, 7 

 whooping cough, 347 

 Wilson's theory, 150 

 wind, 34, 67, 119, 131-147, 646, (137) 



and soil, 300-301 



and weather, 121, 125, 131-147 



anti-trade, 132, 134, 616 



belts, 132, (133) 



causes of, 131, 132, 134 



defined, 131 



effects of, 131, 134-136, (138) 



instruments, 138-139 



pressure, 131, 132, 282 



trade, 133, 643, (133) 



velocity, 131 

 windows as ventilators, 112, 113, 



348-349 



windpipe, 342, 400 

 wind tunnels, 606 

 wireless communication, 234-238, 



548, 549 



wisdom tooth, 399 

 wood, 81, 84, 85, 89, 91, 93, 105, 



205, 259, 516, 532 

 wood alcohol, 91, 380, 646 

 wood-producing plants, 532 

 wood pulp, 516 

 work, 243, 646 

 world, balanced, 535-545 



