INDEX 



Aberration: chromatic, 301, 304, 305; 



correction of, 303, 305; spherical, 301, 



303 



Accumulator, electric, 231 

 Acid, 176 



Acids, naming of, 177 

 Ader, Clement, 91 

 Aeroplane, 78, 85, 90; balancing the, 



93, 94; early history of, 85, 90, 94; 



flights, 91, 94; height record, 95; 



international meet, 95; mail service, 



96; making model, 96; propeller, 99; 



speed record, 96; transatlantic flight, 



96 



Agate, 54 

 Air: compression of, 144; conquest of, 



77; moisture in, 155, 156; movements 



of, 156; weight of, 112 

 Air column, vibration of, 330, 331 

 Air compressor, 144 

 Air pressure, demonstrating, in, 112 

 Alabastine, 56 

 Albite, 56 

 Alcohol, wood, 162 

 Alcor, 20, 31 

 Alcyone, 31 

 Aldebaran, 31, 34, 35 

 Algol, 25 

 Alpha rays, 173 

 Aluminium, 167, 170 

 Amalfi, 2 op 

 Amethyst, 54 

 Ammeter, 195, 227 

 Amperage, 227 

 Ampere, 227 

 Ampere, Andre, 207, 233 

 Ampere's law, 207 

 Amphibole, 50, 58, 61; characteristics 



of, 58, 61 

 Amygdaloid, 65 

 Andesite, 66, 68, 70 

 Andromeda, 25, 26, 27 

 Anorthite, 56 



Antares, 38, 39 



Antenna of wireless, 252, 253, 256; 



making, 265 

 Anthracite, 74 

 Antitrade winds, 156 

 Apatite, 50 

 Aquamarine, 51 

 Aquarius, 39, 41 

 Arc light, 247 

 Archer, 39 



Archers, Royal Scottish, 136 

 Archery, 136 

 Archimedes, 115 

 Archytas, 85 

 Arcos, 21 

 Arcturus, 20 

 Argo Navis, 40, 41 

 Argon, 167, 170 

 Aries, 36 



Arm of man, 342, 343 

 "Armada," Spanish, 118 

 Armature, 236 

 Arrow-maker, Indian, 135 

 Artemis, n 

 Asbestos, 59, 153 

 Ashtaroth, n 

 Asteroid, 2 

 Astrologer, 2, 39 

 Astrology, 39, 40 

 Astronomy, 40 

 Atlas, 31 

 Atmosphere: moisture in, 155, 156; 



movements of, 156; pressure of, in, 



112 

 Atom, 148, 149, 163, 165; nucleus of, 



165-67 



Atomic theory, 165, 168 

 Atoms, structure of, 165-71 

 Audio frequency, 255 

 Augite, characteristics of, 58, 61 

 Auriga, 29, 30 



357 



