Accelleration, a body moving faster and faster.
Action and re-action, equal and contrary, vol. I. p. 96.
Curious instance of, I. 98.
Adhesion, a sticking together.
Air, a fluid, the pressure of which is very great II.
199, 200. Its pressure, experiments on, II. 222-
235. Its weight, how proved, II. 236. Its elasti-
city, II. 244-249. Its compression, II. 255–262.
Necessary to sound, II. 273.
Air-gun, structure of, explained, II. 269, 270.
Air-pump described, II. 206. Its structure explained,
II. 207-210. Experiments on, II 212 and 263.
Alcohol, ardent spirit: equal parts of alcohol and wa-
ter make spirits of wine.
Alkaline, a saline taste.
Anamorphoses, distored images of bodies,
Ancients, their mode of describing the constellations,
II 179.
Angle, what it is, L. 14. How explined, ib. Right,
obtuse, acute, ib. How called, 15.
Animals, all kinds of, affected by Galvanism, IIL
Aphelion, the greatest distance of a planet from the
Apogee, the sun's or moon's greatest distance from
the earth.
Aquafortis, of what composed, L. 20.
Archimedes proposed to move the earth, L 104. Some
account of II. 123. His inventions, II. 124.
Arrow, to find the height to which ascends, I. 61,62.
Atmosphere, the effect of, III. 42, 43.
Attraction, the tendency which some parts of matter
have to unite with others.
Attraction capillary, what meant by, I. 32. Illustra-
ted, 1.33.
Attraction and Repulsion, electrical, III. 217 and 242.
-,magnetic, III. 189, &c.
Aurora Borealis, vulgarly called the Northern lights.
Its use in the Northern parts of the globe, I. 304.
Imitated, III. 313. A curious one described, III.
315.
Balance, hydrostatical, described, II. 106.
Balances, false, how detected, I. 115.
Ball, why easily rolled, 1. 67. Scioptric, its effect,
Barometer explained, II 238 and 361-368. Its con-
struction, II. 351. Its use, 352. Standard altitude
of, II. 335. Variation of, ib. To measure altitudes
with, 11. 361,
Battery, electrical, III. 271, &c. Experiments on
III. 276.
Beccaria, his observation, III. 311.
Bellows, hydrostatical, II. 58-65.
Birds, how they support themselves in the air, I. 85.
Bissextile, the meaning of the word, I. 266.
Bodies, heavenly, why move in a curved path, I. 95.
Elastic and non-elastic, illustrative of the third law
of motion. Weight of, diminished as the distance
from the centre of the earth is increased, I. 52.
Falling the law of their velocity, I. 63. How to
insulate III. 233. Sonorous, elastic, II. 280. Hea-
venly, the latitude of, I. 195.
Body, moving one, what compels it to stop, I. 82.
Bodies, their vis-inertiæ, I. 88.
Boyle, Mr. first saw the electrical light, III. 214.
Bride's (St.) church, damaged by lightning, III. 304.
Bucket, how suspended on the edge of a table, I. 74.
Buffon, M. his experiments, III. 88.
Bullets, leaden, how made to cohere, I. 26.
Camera obscura, III. 173, &c.
Cannon, the sound of, II. 278.
Capillary attraction, fluids attracted above their level,
by tubes as small as a hair.
Cardinal points, how distinguished, I. 171.
Cavallo, Mr. his electrical experiments, III. 303.
Catoptrics, the science of reflected light.
Centre of gravity, the point of a body, on which, when
suspended, it will rest. Between the earth and
sun, I. 236. How applicable to the common ac-
tions of life, I. 72.
Centrifugal force, is the tendency which a body has
to fly off in a straight line.
Centripetal force, is the tendency which a body has to
another about which it revolves.
Chatterton, his lines on the solar system, I. 204.
Circles, Galvanic, what, III 363. First order, ib. Se-
cond order, ib. The most powerful, III. 364.
Clepsydra, principle of, explained, II. 77.
Clocks and Dials, why not agree in the measure of
time, I. 259-264.
Cohesion, attraction of, L. 24. How defined, I. 25. In-
stances, I. 26. Its force, L. 27. How overcome, ib.
Instances of, I. 28.
Coining, apparatus for, referred to, I. 156.
Colours, the cause of, III. 76.
Comets, in what respects they resemble planets, I.
336. The heat of one calculated, L. 337.
Compression, the act of squeezing together.
Condensation, the act of bringing the parts of matter
together.
Conductors, electrical, what meant by, III. 221. Ta-
ble of III. 225. Galvanic, III. 362. Perfect and im-
perfect, ib.
Cone, double, why it rolls up a plane, I. 74.
Contact, touching.
Converge, drawing towards a point.
Cookery, some operations of, how accounted for. 1. 29.
Crane, the principles of a, I. 129. One invented by
Mr. White, I. 131. Distiller's described, II. 162.
Cupping, the operation of, explained, II. 251, 252.
Cups, hemispherical, experiments on, II. 232.
Cylinder, how made to roll up a hill, I. 74.
Dancers, rope or wire, how they balance themselves,
I. 71.
Day, astronomical, when begins, I. 191. The differ-
ence between the solar and sidereal, I. 257.
Day and Night, how explained, I. 226.
Days and Nights, why of different lengths, I. 231,
232, &c. To whom always equal, I. 243.
Deception, optical, I. 162. In feeling, I. 163.
Deceptions, on the public, by short weights, how de.
tected, I. 115, Occasioned by swift motions, I.
221. Optical, III. 36.-40, and 109, &c.
Delaval, Mr. his experiments, III. 81.
Density, compactness. Constitutes specific gravity,
II. 99.
Diagonal, the lines which joins the opposite corners
of a square or other right lined figure.
Digester, used for making soups.
Direction, line of, how defined, I, 64. Must be with
in the base of a body that stands secure, I. 65.
Distance, measured by sound, II. 282.
Diver's Bell, described, II. 166-168. How used, II.
169-172. Accidents with, II. 173, 174. Smea-
ton's improvements on, II. 175. Walker's improve
ments on, II. 176. Anecdote of, II. 177.
Diverge, to spread out.
Earth, centre of, why bodies move to it, I. 18. Why
not apparently moved, I. 49. Its shape, I. 211. Its
diurnal motion, I. 212, 215-224. The velocity of its
motion, I. 222. When its motion is quickest, I. 263.
Its annual motion, I. 223. and 232-237. Its rota-
tion, the most uniform motion in nature, I. 257. A
satellite to the moon, 1. 278. No arguments
against its motion, because not apparent, I. 218.
Its magnitude, I. 222, 223. Its globular figure, I.
206. How proved, I. 207-211. Its poles, what, I.
212. Its axis, I. 213.
Echo, the nature of, explained, II. 294, &c. Curious
ones noticed, II, 304. Applied to the measuring
of distances, II. 305.
Eclipse, an occultation of the sun or moon.
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