358 



OUR PHYSICAL WORLD 



Automobile, 191; tires, 145 

 Avion, 91, 92 

 Axe, 349 

 Azurite, 50 



Bacquerel, 173 



Balance, 340 



Balloon, 78, 104, 105, 107, 109; dirigible, 

 108-10; first ascension, 104, 105; 

 history of, 104; hot-air, 104; hydro- 

 gen, 106; kite, 107; military, 106; 

 transatlantic flight of, 109; why it 

 rises, 109-16 



Banjo, 328 



Barometer, 112 



Basalt, 63, 66, 69, 70 



Base, 176 



Battery: bichromate, 224, 230; Bunsen, 

 224, 230; current of, 222, 224, 226; 

 DanieU, 224; dry, 230; electric, 

 207, 222, 229; gravity, 224; opera- 

 tion of, 222, 224; polarization of, 

 223; poles of, 223, 224; storage, 

 192, 231, 232 



Batteries: in series, 226; parallel, 226 



Bear, Big, 20; legends of, 21 



Bear, Little, 20, 21, 22 



Bell, Alexander Graham, 218 



Bell: electric, 221; vibrations of, 326, 

 327 



Beryl, 51 



Beryllium, 166, 167, 170 



Besnier, 86 



Bessemer converter, 162 



Beta rays, 173 



Betelgeuse, 18, 32, 34 



Bichromate battery, 224, 230 



Bicycle, 346 



Biotite, 59 



Biplane, 90 



Bleriot, Louis, 95 



Boat, 78, 117, 119, 133; floating of, 117; 

 history of, 119; motor, 119; records 

 of, 118, 119; sail, 117, 1 18; sailing of, 

 118 



Boats, various kinds of, 119, 120, 121 



Boiling-point, 172 



Bootes, 20 



Borax, 50 



Bornite, 50 



Boron, 166, 167, 170 



Bow and arrow, 133, 134 



Bow: ^how to shoot, 137; long, 134; 



making, 137; of Eskimos, 134 

 Bowmen, 134; organizations of, 136 

 Breccia, 73 

 Bromine, 172 

 Bronze, 158 

 Bronze Age, 158 

 Bull, the, 30, 31, 32 

 Bullet, 141, 142 

 Bunsen battery, 224, 230 

 Burning, nature of, 149 

 Buzzer, electric, 222 



Cable, transatlantic; 213, 215; com- 



pletion of, 215 



Calcite, 45, 47, 48, 50, 61; character- 

 istics of, 55, 6 1 



Calcium hydroxide, 176 



Callisto, 20 



Calms, belt of, 156 



Calorie, 228, 229 



Calumet and Hecla mine, 47, 127 



Cam, 193, 194 



Camera, 309, 310; back swing of, 310; 

 box, 309; Brownie, 309; film, 310, 

 315; focusing the, 310; Graflex, 

 315, 316; method of handling, 313; 

 obscura, 284, 285; pin hole, 283, 284, 

 309; reflecting, 315; timing device 

 of, 3H 



Cancer, 174 



Candle power, 283 



Canis Major, 33, 34, 40 



Cams Minor, 33, 34 



Cannon: early, 143; location of, by 

 sound, 337 



Canoe, 120 



Capacity, 255, 258 



Capella, 29 



Capricornus, 40 



Capstan, 343, 344 



Carbon, 166, 167, 170 



Carbon disulphide, 292 



Carbon monoxide, 191 



Carburetor, 192, 194, 195 



