A System of Natural Philosophy: In which the Principles of Mechanics, Hydrostatics, Hydraulics, Pneumatics, Acoustics, Optics, Astronomy, Electricity, and Magnetism, are Familiarly Explained, and Illustrated by More Than Two Hundred Engravings : to which are Added Questions for the Examination of the Pupils : Designed for the Use of Schools and Academies |
From inside the book
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Page viii
... orbits of the planets , Elliptical orbits of the planets , 220 Lunar eclipses , 221 Solar eclipses , Comparative dimensions of the planets , 222 Earth passes equal areas at equal times , 226 Motion of the earth round the sun , Circles ...
... orbits of the planets , Elliptical orbits of the planets , 220 Lunar eclipses , 221 Solar eclipses , Comparative dimensions of the planets , 222 Earth passes equal areas at equal times , 226 Motion of the earth round the sun , Circles ...
Page 15
... orbits as they pass through the heavens , Attraction has received different names , according to the circumstances under which it acts . The force which keeps the particles of matter together , to form boles , or masses , is called ...
... orbits as they pass through the heavens , Attraction has received different names , according to the circumstances under which it acts . The force which keeps the particles of matter together , to form boles , or masses , is called ...
Page 17
... orbits , by mutual at- traction . The force of attraction increases in proportion as bodies approach each other , and by the same law it must diminish in proportion as they recede from each other . Attraction , in technical language ...
... orbits , by mutual at- traction . The force of attraction increases in proportion as bodies approach each other , and by the same law it must diminish in proportion as they recede from each other . Attraction , in technical language ...
Page 37
... orbit from west to east , is 68,000 miles in an hour ; that of Mars , in the same di- rection , is 55,000 miles per hour . The earth's relative velocity in this case , is 13,000 miles per hour from west to east . That of Mars ...
... orbit from west to east , is 68,000 miles in an hour ; that of Mars , in the same di- rection , is 55,000 miles per hour . The earth's relative velocity in this case , is 13,000 miles per hour from west to east . That of Mars ...
Page 57
... orbits , and in the case we have supposed , our cannon ball would become a little satellite , moving perpetually round the earth . Resultant Motion . Suppose two men to be sailing in two boats , each at the What is that called , which ...
... orbits , and in the case we have supposed , our cannon ball would become a little satellite , moving perpetually round the earth . Resultant Motion . Suppose two men to be sailing in two boats , each at the What is that called , which ...
Common terms and phrases
air pump angle appear atmosphere attraction axis balance ball barometer barrel boat bulk called centre of gravity centrifugal force circle colors common concave mirror consequence convex lens convex mirror degrees descend diameter direction distance earth eclipse elastic electric equal equator exactly Explain fig falling body feet filled fluid fulcrum glass greater heat hence hydrometer illustrated inches inclined plane increased instrument kind of lever length lens less machine magnetic mercury meridian metals miles moon motion move object obliquely orifice particles pass pendulum perpendicular piece pipe piston poles pounds pressure principle proportion pulley quantity of matter raised rays of light reflected reflecting telescope refracted respect retina revolution revolve rise rope round screw seen side space specific gravity stars substances sun's Suppose surface suspended telescope thrown tion tube turned upwards valve velocity vessel vibrations visual angle weight
Popular passages
Page iv - In conformity to the act of Congress of the United States, entitled, " An act for the encouragement of learning, by securing the copies of maps, charts and books, to the authors and proprietors of such copies, during the times therein mentioned ;
Page iv - BBOWN, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit : " Sertorius : or, the Roman Patriot.
Page 128 - ... proceeding, when the captain's order came to prepare with all haste for a storm. The barometer had begun to fall with appalling rapidity. As yet, the oldest sailors had not perceived even a threatening in the sky, and were surprised at the extent and hurry of the preparations: but the required measures were not completed, when a more awful hurricane burst upon them than the most experienced had ever braved.
Page 236 - ... by which it is illustrated, that the sun constantly shines on a portion of the earth equal to 90 degrees north, and 90 degrees south from his place in the heavens, and consequently, that he always enlightens 180 degrees, or one half of the earth. If, therefore, the axis of the earth were perpendicular to the plane of its orbit, the days and nights would...
Page 232 - It has already been explained, that the ecliptic is the plane of the earth's orbit, and is supposed to be placed on a level with the earth's horizon, and hence, that this plane is considered the standard, by which...
Page 128 - ... hurricane burst upon them than the most experienced had ever braved. Nothing could withstand it; the sails already furled and closely bound to the yards, were riven away in tatters; even the bare yards and masts were in great part disabled; and at one time the whole rigging had nearly fallen by the board.
Page 18 - The intensity of light is found to increase and diminish in the same proportion. '^Thus, if a board a foot square, be placed at the distance of one foot from a candle, it will be found to hide the light from another board of two feet square, at the distance of two feet from the candle.
Page 290 - By connecting together a sufficient number of these jars, any quantity of the electric fluid may be accumulated. For this purpose all the interior coatings of the jars are made to communicate with each other, by metallic rods passing between them, and finally terminating in a single rod. A similar union is also established, by connecting the external coats with each other. When thus arranged, the whole series may be charged, as if they formed but one jar, and the whole series may be discharged at...
Page 215 - Different opinions have been entertained by astronomers respecting the cause of these belts and spots. By some they have been regarded as clouds, or as openings in the atmosphere of the planet, while...
Page 285 - The friction of the rubber against the glass plate (or cylinder) produces a transfer of the electric fluid from the rubber to the plate ; that is, the cushion becomes negatively and the glass positively electrified. The fluid which thus adheres to the glass, is carried round by the revolution of the cylinder ; and its escape being prevented by the silk...