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U & V.

Undulation, swinging or vibrating.
Vacuum, a place void of air,
Valve, a sort of trap door.
Valves, what meant hy, II. 180.
Vegetables, how blanched, III. 79.
Velocity, a term applied to motion. Accelerating what

meant by, I. 56.
Venus, the planet, its distance from the sun; the velo-

city of its motion ; its magnitude, I. 312—315.
Why an evening and why a morning star, I. 315.

Transit of, what meant by, I. 316.
Vernier, its construction and use, II, 356.
Vertex, the top of any thing.
Vibration, the swinging motion of a pendulum.
Vision, the manner of, ÜI. 120.
Vdatile, any light substance that easily evaporates,
Voltaic batteries, III. 356–358. Shock, III. 357

359.
Voltaism, III. 356,f&c.
Wall, leaning one, at Bridgnorth, 1. 68.
Water, pure rain, the standard to compare other bo.

dies with, II. 97. Weighs the same every where.
ib. Always deeper than it appear to be, II. 153
and IH. 36. How raised from deep wells, II. 191
- 193. Formed of two gasses, III. 351. Decom-
posed, III. 367.

W.

Water-spouts, their cause, III. 318. How dispersed,

III. 319.
Weather, rales for judging of, II. 399--401.

Wedge, a triangular piece of wood or metal, to cleave

stone, &c. Its principle explained, I. 145. Its ad-
vantages in cleaving wood, I. 146. What instru-

ments referred to, I. 147.
Well, how to find the depth of one, I. 58.
Wheel and axes described, I. 126. For what purposes

used, ib. Its power estimated, I. 127. How in-
creased, I. 128. Explained on the principle of the

lever, I. 131.
White, Mr. James, his invention of a crane, I. 130.

His patent pulley, I. 137.
Wind, what it is, II. 312. The cause of, II. 313.

Experiment on, II. 314 and 319. Definition of,
II. 315. Its direction denominated, ib. The cause
of its variableness in England, II. 320. How to find

its velocity, II. 322. Table of, 11. 324.
Winds, how many kinds, and why so named, II.

315.
Winter, why colder than the summer, I. 247.

Y.

Year, its length, how measured, I. 265. Gregorian,

what meant by, I. 268. The beginning of, changed
from the 25th of March to the 1st of January,
I. 269.

2.

Zenith, that point of the heavens over one's head.
Zinc, experiment with, III. 350.
Zodiac, a belt in the heavens, sixteen degrees broad,

through which the ecliptic runs. Signs of, I. 186.
Dr. Watts's lines on, I. 189.

GALVANISM, OR VOLTAISM.

XLIII.

XLIV.

XLV.

The Origin of Galvanism

Galvanic Light and Shocks

Voltaic Conductors, Circles, Tables,

347

354

&c.

XLVI.

XLVII.

Miscellaneous Experiments

Glossary and Index

362

370

379

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