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BAT
luminous effects, 450; physiological

effects of, 448 ; voltaic, 443
Batteries, constant, 445 electric, 416
Beacons, 332
Beam, 47
Beaume's hydrometer, 103
Bellows, 181
Bernouilli's laws, 182
Berthollet's apparatus, 135 .
Bladder of fish, 98
Blood globules, 8
Binocular vision, 372
Biot's experiment, 396
Baroscope, 149
Bodies, equilibrium of, 44; general

properties of, 6; internal consti-

tution of, 4
Boiling, 232 ; laws of, 233
Boiler, steam, 256
Bologna, Tower of, 46
Boyle's law, 132
Brahma's press, 82
British units, 103
Buffon's burning mirrors, 201
Bulging of earth at the equator, 30
Bunsen's battery, 447 ; burner, 338
Bunsen and Kirchhoff's researches,

337, 338
Bunten's barometer, 122
Buoyancy of liquids, 79
Burning glasses, 331 ; mirrors, 201

CON
spectrum, 335; hygrometers, 262;

phenomenon, 1
Cheval vapeur, 255
Chimes, electrical, 405
Chimneys, draughts in, 217
Chlorine, 218
Chords, 169
Choroid, 370
Chromatic scale, 171
Circuit, 468
Cirro-cumulus, 270
Cirro-stratus, 270
Cirrus,' 270
Cistern barometer, 120
Climate, 268
Clouds, 270; formation of, 271
Coercive force, 379
Cohesion, 62
Coil, primary, 478 ; secondary, 478
Cold, 280 ; by expansion of gases,

287 ; due to evaporation, 237 ; npc-

turnal radiation, 288
Collecting plate, 417
Collimation, 351
Collodion, 366
Colours of the spectrum, 334
Cooling, condensation by, 240
Combustion, 285
Comma, 169
Communicator, 468 .
Commutator, 468
Compass, inclination, 383; mariner

382

CESIUM, 339
u Caloric, 245
Calorific capacity, 246
Calorific effects of the spectrum, 335
Calorimetry, 245
Camera obscura, 363, 364 ; portable,

365
Capillarity, 64
Captive balloon, 151
Cartesian diver, 97
Catoptric telescopes, 353
Celsius scalc, 190
Centesimal alcholometer, 106
Centigrade scale, 190
Centimeter, 103
Centre of gravity, 40; determination

of, 42
Centrifugal force, 28
Charge of electrical machine, 400
Chemical affinity, 62; attraction, 3,

4; combinations, 285; effects of
the electric battery, 451 ; of the

Compensation pendulum, 213
Complementary colours, 343
Component forces, 23
Compound microscopes, 356
Compound musical tones, 173
Compound pendulum, 56
Compressibility, II
Compression pump, 13
Concave mirrors, 201, 305 ; formation

of images in, 309; reflection of heat

from, 201
Concert pitch, 172
Concurrent forces, 26; resultant of,

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Drum, 154

CON

ELE
Conductors, 393; bad, 207 ; good, ! Dial telegraph, 468
207

Diamond, 313
Conductor, the earth as a, 471 ; light- ! Differential thermometer, 193
• ning, 433, 475

Diffused light, 298
Conductivity of bodies, applications, Digester, 235

210 ; of liquids, 208 ; of gases, 209; Dip, magnetic, 383
of solids, 207

Dipping needle, 383
Congelation, 222

Discharge, slow and instantaneous,
Conjugate focus, 307, 327

413
Connecting rod, 250

Discharger, universal, 421
Consonance, 169

Discharging rod, 413
Constant batteries, 445

Dispersion of light, 333
Contractile force, 212

Dissolving views, 360
Convex lenses, 328, 329

Dissonance, 169
Convex mirrors, 305 ; formation of Distance of distinct vision, 371
images in, 310

Distillation, 242
Cornea, 370

Divisibility, 8
Cornet-à-piston, 183

Diorama, 368
Corpuscular theory, 289
Coulomb's balance, 392

Ductility, 71
Couronne des tasses, 441

Dynamometer, 22
Cubical expansion, 186, 211

Dominant chords, 169
Cumulo-stratus, 270

Dove's law of rotation of winds,
Cumulus, 270

279
Cross-wire, 351

Double action machine, 249; descrip-
Crown-glass lens, 347

tion of, 250
Crystalline, 370
Crystals, 223
Crutch, 60
Current, electricity, 440 ; terrestrial, 1. Earth currents, 434
466 ; thermo-electric, 483

Earth, flattening of at the poles, 30;
Currents on currents, reciprocalactions radius of, 30
of, 461 ; upon magnets, action of,

Ebullition, 232
456 ; action of magnets and of the Eccentric, 251
earth on, 458; induction by, 478 ; Echoes, 161
magnetisation by, 460; properties Eolipyle, 248
of induced, 480

Egg, electric, 408
Curvature, 84

Elastic force of aqueous vapour, 236 ;
Curvilinear motion, 15

fluids, 108
Elasticity, 12, 13

Electric batteries, 416; egg. 408 ;
DAGUERREOTYPE, 366

spark, 405, 421 ; telegraphs, 468
D Damper of piano, 177

Electric discharge, effects of, 418;
Dancing puppets, 406

phenomena of, 418; physiological
Daniell's battery, 446; hygrometer, effects of, 418
262

Electric light, 450 ; stratification of,
Dark lines of the spectrum, 336

482; electric alarum, 476; attraction
Decomposed force, 25

and repulsion, 391 ; chimes, 405 ;
Decomposition of water, 451

condensers, 412; discharge, mag-
Declination, 381

netic effects of, 425 ; machine, 399;
Degrees, Fahrenheit, 190 ; Réaumur, measurement of charge of, 400;
190

pendulum, 388 ; portraits, 422 ;
Density 2, of gases, 218

whirl, 407
Despretz's experiment, 449

Electrical Áuids, hypothesis of two,
Developer, 366

390 ; positive and negative, 390
Dew, 273; point, 262

Electricity 386 ; atmospheric, 427

trumpet, 165

426

ELE

GLA
current, 440 ; in chemical actions | Flexure, 12
439.; by friction, law of, 395 ; in- |

Float, 257
duction, 398 ; influence of shape of Florentine experiment, 9
body on, 397 ; mechanical effects of, Flint glass lens, 347

423 ; on the surface of bodies, 396 Fluids, aeriform, 5; elastic, 108';
Electrification of conductors, 394

magnetic, 377; vital, 436
Electro-chemical series, 452

Flute, 183
Electrodes, 442

Fly wheel, 250
Electrodynamics, 461

Foci, 324; acoustic, 161; and images,
Electrogilding, 454

330
Electrolysis, 452

Focus, 201, 306, 308, 326; conjugate,
Electromagnets, 467 .

307, 327
Electrometallurgy, 453

Fogs, 269
Electrometer, Henley's, 400

Foot, cubic, 103; pound, 255
Electromotive force, 441; series, Force, centrifugal, 28; direction of,
441

21
Electrometer, 468

Forces, 21, 22, 23, 24, 27
Electronegative and electropositive Fortin's barometer, 121
elements, 452

Fountain, Hero's, 142; intermittent,
Electrophorus, 401

143; in vacuo, 139
Electroscopes, 388 ; condensing, 417; Franklin's lightning-conductor, 433;
gold leaf, 402

experiment on ebullition, 234; kite,
Electrotype, 453
Elements, 3

Frauenhofer's lines, 336
Emission of heat, 184

French units, 103
Emission theory, 289

Fresnel's lenses, 332
Emissive power, 204

Freezing mixtures, 225
Engines, fire, 147 ; high pressure, 254, Friction, electricity by, 395 ; heat due
255

to, 281 ; wheels, 54
Epinus's condenser, 12

Frog current, 437
Equality of pressures, 75

Fulcrum, 32
Equilibrium, 27.; of bodies, 44, 45; Fulgurites, 431

of floating bodies, 96 ;*liquids, 83, Fusion, 219; laws of, 220; of ice,
86, 87, 88

247 ; vitreous, 219
Escapement, 60 ; wheel, 60
Evaporation, 231 ; cold due to, 237 ;
latent heat of, 237

CALILEO'S telescope, 350
Expansibility of gases, 5, 110

J Gallon, 103
Expansion, 186, 211 ; of gases, cold Gamut, 168

produced by, 286; of liquids, 214; Galvanic shock, 448
real or apparent, 214; of solids, Galvani's experiment, 436
211, 212

Galvanometer, 459; uses of, 459
Extension, 6

Gases, 5, 108 ; conductivity of, 209 ;
Eye, structure of, 370; white, 370

density of, 218; expansibility of, 5,
110 ; laws of mixture of, 135;

liquefaction of, 244 ; permanent,
FAHRENHEIT degrees, 190; hy 244; value of the expansion of, 216;
I drometer, 102

weight of, 111
Falling bodies, laws of, 51

Gases and liquids, mixture of, 136
Feed pump and cold water pump, Gauss and Weber's electro-magnetic
249, 253

telegraph, 468
Filtration, 10

Ghost scenes, 369
Finder, 351, 353

Glasses, weather, 127
Fire engines, 147

Globe, luminous, 410
Fish, swimming-bladder of, 98

Globules, 8
Flame, 285

| Glaisher's factors, 262

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GLA
Glasses, burning, 331
Gold-leaf, 72; electroscope, 402
Gold-beater's skin, 72
Goniometer, reflecting, 311
Grain, 103
Gramme, 103
Graphite, 453
Gravesand's ring, 186
Gravitation, 36
Gravities, specific, 100
Gravity, 37, 42; centre of, 40; flask,

101, 102; measurement of the force

of, 59
Grindstone, 34
Gulf stream, 266

Hydrometers, 102, 104, 105; Nichol-

son's, 101
Hydrostatical balance, 95, 101, 102 ;

paradox, 80
Hydrostatics, 73
Hydrogen, density of, 218
Hydrometric state of air, 262
Hygrometry, 260
Hygroscopes and hygrometers, 261

TCEBERGS, 222
1 Ice, fusion of, 247; latent heat of,

221 ; machine, 225
Images, 300; accidental, 343 ; and

foci, 330 ; in concave mirrors, 309,
310; multiple, 303 ; real, 309, 328 ;
and virtual, 302, 329 ; reversed,

304 ; symmetrical, 302
Imbibition, 68
Immersed bodies, equilibrium of, 96
Impenetrability, 7
Impermeable strata, 93
Incidence, angle of, 200, 312 .
Inclination compass, 383; magnetic,

383
Inclined plane, 52 ; bodies falling by,

I. 53

HAIL, 275
11 Hardness, scale of, 70
Hammer, water, 51
Harmonics, 173, 182
Harmonic triad, 169
Hawksbee's air-pump, 137
Heat, 184 ; applications, 206 ; atmo-

spheres, 184 ; a condition of matter,
184 ; different sources of, 280 ; form
of motion, 184 ; due to friction,
281 ; due to pressure and percus-
sion, 282; general effects of, 185;
force of, 4; interchange of, 199;
latent, of ice, 221 ; law of reflection
of, 200 ; of water, 221 ; lightning,
429 ; radiant, 196 ; refraction of,
331 ; from concave mirrors, 201,
specific, 246 ; terrestrial, 284; in

vacuo, 197
Heaters, 256
Heating by steam, 242
Height of the atmosphere, 129
Heights determined by barometer,

128
Heliostat, 311
Hemispheres, Magdeburg, 115
Henley's electrometer, 400
Hero's fountain, 142
Herschel's telescope, 354
Hiero's golden crown, 95
High pressure engine, 254
Hippocrates, strainer of, 10
Hoar frost, 273
Hope's experiments, 215
Horn, 183
Horse power, 255
Hooke's barometer, 127
Hydraulic press, 82; tourniquet, 78
Hydrofluoric acid, 190

:

Indicator, 468
Indium, 339
Induced currents, properties of, 480
Induction, coils, 481; by the earth,

479; by currents, 478 ; electricity
by, 398 ; magnetic, 378 ; by mag-

nets, 379
Inertia, 18, 19
Ingenhousz's apparatus, 207
Inkstand, syphon, 144
Insulating bodies, 394 ; stool, 404
Instruments, mouth, 183; wind, 183
Intervals, 169
Irradiation, 344
Iris, 370
Isochimenal lines, 267
Isochronism, 57
Isoclinic lines, 383
Isogeothermic lines, 267
Isotheral lines, 267
Isothermal lines, 267; zone, 267

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KAM
KAMSIN, 278

M ACHINE, 31; weighing, 50
Key-note, 170

M Mackarel sky, 270
Kepler's telescope, 351

Magdeburg hemispheres, 115
Kilogrammeter, 255

Magic lantern, 358 ; plane, 409
Kirchhoff's and Bunsen's researches, Major chord, 169; semitone, 169;
338

tone, 169
Kite, Franklin's, 426

Magnetic attraction and repulsion,
Knife-edge, 477

376; batteries, 385; dip, 382 ;
equator, 383 ; effects of electrical

discharge, 425; fluids, 377; in-
I ACTOMETER, 107

duction, 378; meridian, 381; needle,
L Land breeze, 278

374, 376, 456; poles, 383; sub-
Latent heat, 221 ; of vapours, 237

stances, 378
Lateral pressures, 78

Magnetisation of the earth, 384; by
Latitude, influence of on temperature, currents, 460 ; limit of, 465; by
265

magnets, 384; by touch, 384
Lavoisier and Laplace's ice calori Magnetism, Ampère's theory of, 465;
meter, 247

and electricity, 455 .
Laws of falling bodies, 51 ; of radia Magnets, action of current upon, 456;
tion, 197

of the earth on, 380 ; consequent
Length, unit of, 22

points of, 375; distribution of
Lenses, 322; achromatic, 347 ; crown magnetic force in, 375; in the

glass, 347 ; different kinds of, 322 ; earth, 458 ; induction by, 479; in-
flint glass, 347 ; principal axis of, fluence of, in magnetic substances,
322 ; properties of double convex, 378 ; natural and artificial, 374,
327 ; real images in, 328

463
Leslie's cube, 202 ; differential ther Malleability, 72
mometer, 193

Manhole, 256
Levers, 32; applications of, 34 ; arms Manometer, 133 ; compressed air,
of, 32; effect of, 33

133; open air, 133
Levelling staff, 89

Mares' tails, 27
Level of liquids, 84, 85; spirit, go Mariner's compass, 382
Leyden jar, 415

Mariotte's law, 132
Lift-pumps, 145

Mass, 2
Lightning, 426, 429 ; ascending, 441 Mason's apparatus, 80
conductor, 433, 475

Matter, 2
Light, absorption of, 291 ; diffused, Maximum density of water, 215

298 ; dispersion of, 333 ; electric, Mean time, 331
450 ; intensity of, 295 ; propaga Mechanics, 31
tion of, 292; reflection of, 296; | Melloni's thermomultiplier, 485
scattered, 298; sources of, 289, | Mercurial thermometers, 188, 192
290 ; velocity of, 294

Meridian, magnetic, 381 ; quadrant
Lighthouses, 331

of, 103
Line wire, 470

Metalloids, 3
Loadstone, 374

Metals, 3
Long sight, 371

Meteorology, 263
Loops, 182

Meter, 103
Liquefaction of gases, 244; of va Metronome, 61
pours, 240

Microscopes, 355 ; compound, 356 ;
Liquids, 5; buoyancy of, 79; con origin and use of, 357; photo-
ducting power of, 207 ; equilibrium electrical, 361 ; solar, 362
of, 83, 86 ; expansion of, 214; Minor chord, 169; semitone, 170 ;
fixed, 226 ; level of, 84 ; pres tone, 169
sures from, 77; specific gravity Minimum thermometer, 194

of, 102 ; superposed, 88 ; volatile, 226 Mirage, 318
Luminiferous ether, 289

| Mirrors, 300; applications of, 311 ;

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