Page images
PDF
EPUB

W

Wall, leaning one, at Bridgnorth, i. 50.
Water, pure rain, the standard to compare other

bodies with, ii. 69. Weighs the same every
where, ib. Always deeper than it appears to be,
ii. 107, and iii. 36. How raised from deep wells,
ii 131, 132. Formed of two gases, iii. 244.

Decomposed, iii. 255.
Water-spouts, their cause, iii. 220. How dispersed,

ib.
Weather, rules for judging of, ii. 270—272.
Wedge, a triangular piece of wood or metal, to

cleave stone, &c. Its principle explained, i. 104.
Its advantages in cleaving wood, i. 105. What

instruments referred to, i. 106.
Well, how to find the depth of one, i. 43.
Wheel and axis, described, i. 91. For what pur-

poses used, ib. Its power estimated, i. 92. How
increased, i. 92. Explained on the principle of

the lever, i. 95.
White, Mr. James, his invention of a crane, i. 95.

His patent pulley, i. 99.
Wind, what it is, ii. 212. The cause of, ii. 213. Ex-

periment on, ii. 213 and 217. Definition of, ii.
215. Its direction denominated, ib. The cause
of its variableness in England, ii. 217. How to

find its velocity, ii. 219. Table of, ii. 220.
Winds, how many kinds, and why so named, ii. 214.
Winter, why colder than the summer, i. 177.

Y

Year, its length, how measured, i. 190. Gregorian,

what meant by, i. 192. The beginning of, changed
from the 25th of March to the 1st of January, i.
193.

Z

Zenith, that point of the heavens over one's head.
Zinc, experiment with, iii. 243.
Zodiac, a belt in the heavens, sixteen degrees broad,

through which the ecliptic runs. Signs of, i. 135.
Dr. Watts's lines on, i. 136.

[ocr errors]
[merged small][ocr errors]

ELECTRICITY.

[ocr errors]

Battery

XXXV. Experiments with the Battery

XXXVI. Miscellaneous Experiments

XXXVII. Electrophorus, Thunder-House, &c.

XXXVIII. Atmospherical Electricity

XXXIX. Aurora Borealis ; Water-Spouts; Earth-

quakes

XL. Medical Electricity

XLI. Animal Electricity

XLII. Summary of Electricity

187

192

199

204

208

214

224

228

232

GALVANISM, OR VOLTAISM.

XLIII. The Origin of Galvanism,

XLIV. Galvanic Light and Shocks

XLV. Voltaic Conductors, Circles, Tables, &c.

XLVI. Miscellaneous Experiments

Glossary and Index

241
246

251

257

263

1

« PreviousContinue »