Aberration, 455, 471, 474.
Absolute temperature, 265.
Absolute unit of force, 47.
Absolute units of work, 74.
Absolute zero, 264.

Absorption of gases, 184.

of heat, 257.
of liquids, 125.
Accelerated motion, 36.
Acceleration, 36, 37.

negative, 46.
Accumulator cell, 378.
Achromatic lens, 475.
Actinic rays, 485.
Adhesion, 21, 123.
Aeroplane, 168.
Agonic line, 311.

Air, absorption of heat, 258.
composition of, 166.
compressed, 158-165.

effects of expansion in, 266.
height of, 176.

liquefied, 266, 276.

pressure of, 158-168.

resistance of, 39.

sound transmitted by, 195–199.

water vapor in, 269-273.

wave motion in, 196.
weight of, 165.

Air columns, vibration of, 224.
Air pump, 159.

Air thermometer, 243.
Alcoholmeter, 154.
Algebraic balance, 101.
Alternating current, 409.

Alternator, 410.

Ammeter, 380, 383.

Ammonia, 277.

Battery, 347, 358; see Cells.

Beam of light, 436.
Beats, 209.

water,

Bell, electric, 369; nodes and loops
in, 224.

Bichromate cell, 351.
Block and tackle, 106.
Bodies, defined, 10.
Boiling, 273.

Boiling point, 240.
Bole, 47.

Boyle's Law, 177, 265.
Breaking weight, 22.
Brennan Monorail car, 66.
Brush discharge, 340.

B. T. U., 281.

Bunsen photometer, 441.
Buoyancy, 147.

Cadmium Standard cell, 356.

Calorie, 281.

Calorimetry, 281–285.
Camera, 438, 497.
Capacity, electrical, 327.

specific inductive, 330.

Capacity, unit of, 31.
Capillarity, 124.

Capillary attraction, 125.

Cathode, 374.

Cathode rays, 511.
Cation, 374.

Cells, galvanic, 347, 349.
chemical action in, 347.
loss of potential in, 353.
grouping of, 358.
polarization of, 348.
resistance of, 390.
standard, 356.
storage, 376.

Center, of curvature, 449, 466.
of gravity, 82.

of moments, 58.

of oscillation, 93.

of percussion, 93.

of pressure of liquids, 136.
Centigrade scale, 241.
Centimeter, 30.

Centrifugal force, 63, 81.
Centrifugal pump, 183.
Centripetal force, 63.
C. G. S. system, 28.
Charge, unit, 321.
Charles, Law of, 265.

current, 346.

source of heat, 247.
Chemical change, 9.

Chemical rays, 485.
Chloride accumulator cell, 378.
Chord, in music, 215.
Chromatic aberration, 474.
Chromatic scale, 217.
Chromic acid cell, 351.
Circuit, 347, 426.

Clark cell, 356.

Clinical thermometer, 244.
Closed circuit, 347.

Coal, energy stored in, 297.
Coefficient, of cubical expansion, 262.

of friction, 111.

of linear expansion, 260.
Coherer, 507.

Cohesion, 21, 119.

Collimator, 481.

Collision, heat produced by, 247.
Color, 473.

Comma, in music, 216.

Communicating vessels, liquids in,

138.

Commutator, 404.

Compass, 302.

Complementary colors, 480.
Components, 53, 310.
Composition, of forces, 52.
of velocities, 61.
Compound dynamo, 409.
Compressed air, uses of, 162.
Compressibility, 16, 158.

Compression, heat produced by,
Concave lenses, 465, 469.
Concave mirrors, 449.

Condensation, in sound, 196.
of vapor,
275.
Condenser, distillation, 275.

electrical, 332.
Condensing pump, 161.
Conduction of heat, 248.
Conductors, electrical, 322.
Conjugate foci, 452.
Conservation of energy, 73.
Constant force, effect of, 39.
Convection, 251.

Converging lenses, 465.

Converter, electrical, 431.
Convex lenses, 470.

Copper wire table, 355.
Couple, 60.

Critical angle, 460.

247.