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 Pupils : Designed for the Use of Schools and Academies |
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Page 9
... substance of which we can gain a know- ledge by our senses . Hence air , water and earth , in all their modifications , are called bodies . There are certain properties which are common to all bo- dies . These are called the essential ...
... substance of which we can gain a know- ledge by our senses . Hence air , water and earth , in all their modifications , are called bodies . There are certain properties which are common to all bo- dies . These are called the essential ...
Page 10
... substance can exist without them . By extension , therefore , is only meant these qualities . Extension has no respect to the size , or shape of a body . The size , and shape of a block of wood a foot square is quite dif . ferent from ...
... substance can exist without them . By extension , therefore , is only meant these qualities . Extension has no respect to the size , or shape of a body . The size , and shape of a block of wood a foot square is quite dif . ferent from ...
Page 11
... substance so finely , that it may not again be broken , is unknown . We can conceive , in some degree , how minute must be the particles of matter , from circumstances that every day come within our knowledge . A single grain of musk ...
... substance so finely , that it may not again be broken , is unknown . We can conceive , in some degree , how minute must be the particles of matter , from circumstances that every day come within our knowledge . A single grain of musk ...
Page 12
... substances but only a change of form by the heat , and hence the mercury and wa- ter , assume their original state ... substance , called charcoal . The wood is thus decomposed , or destroyed , and its particles take a new arrangement ...
... substances but only a change of form by the heat , and hence the mercury and wa- ter , assume their original state ... substance , called charcoal . The wood is thus decomposed , or destroyed , and its particles take a new arrangement ...
Page 14
... substances are composed of small atoms , or particles , of matter , and that it is a collection of these , united together , that forms all the objects with which we are acquaint- ed . Now when we come to divide , or separate any substance ...
... substances are composed of small atoms , or particles , of matter , and that it is a collection of these , united together , that forms all the objects with which we are acquaint- ed . Now when we come to divide , or separate any substance ...
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Common terms and phrases
appear atmosphere attraction axle ball barrel called centre of gravity centrifugal force circle colors concave mirror conductor consequently convergent convex lens convex mirror degrees diameter direction distance earth earth's orbit eclipse elastic electric fluid equal equator equinoxes Explain fig falling body feet fixed stars focus fulcrum glass heat hence illustrated inches inclined plane increased instrument length lenses less lever longitude machine magnetic mercury meridian metals millions of miles moon motion move Natural Philosophy object obliquely obvious particles pass pendulum perpendicular piston plane mirror planets poles pounds pressure principle proportion pulley pump quantity of matter raised rays of light reflected reflecting telescope refracted respect retina revolution revolve rope screw seen side solar space specific gravity substances sun and clock sun's Suppose surface telescope thrown tion tube turned velocity vessel visual angle weight wheel
Popular passages
Page ii - 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 time therein mentioned.
Page ii - 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 ii - ... 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,' and extending the benefits thereof to the arts of designing, engraving, and etching historical and other prints.'/ CHARLES A.
Page 207 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.
Page 238 - ... 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 12 - When a piece of wood is heated in a close vessel, such as a retort, we obtain water, an acid, several kinds of gas, and there remains a black, porous substance, called charcoal. The wood is thus decomposed or destroyed, and its particles take a new arrangement, and assume new forms ; but that nothing is lost, is proved by the fact, that if the water, acid...
Page 217 - 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 others imagine that they are of a more permanent...
Page 130 - 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. 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...
Page 266 - The ebbing and flowing of the sea, which regularly takes place twice in 24 hours, are called the tides. The cause of the tides, is the attraction of the sun and moon, but chiefly of the moon on the waters of the ocean. In virtue of the universal principle of gravitation...
Page 208 - Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.