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 21
... hand , or a piece of cloth , and then held towards any light substance , such as hair , or thread , the light body will be attracted by it , and will adhere for a moment to the glass or wax . The influence which thus moves the light ...
... hand , or a piece of cloth , and then held towards any light substance , such as hair , or thread , the light body will be attracted by it , and will adhere for a moment to the glass or wax . The influence which thus moves the light ...
Page 31
... hand , but he soon learns by its painful effects , not to throw it too high . The effects of hail - stones on window glass , animals , and vegetation , are often surprising , and sometimes calamitous illustrations of the velocity of ...
... hand , but he soon learns by its painful effects , not to throw it too high . The effects of hail - stones on window glass , animals , and vegetation , are often surprising , and sometimes calamitous illustrations of the velocity of ...
Page 43
... hand in the direction of b ; it is obvious that the string would prevent its going to that point ; but would keep it in the circle . In this case , the string is the centripetal force . What is the line A F , fig . 13 , called ? What is ...
... hand in the direction of b ; it is obvious that the string would prevent its going to that point ; but would keep it in the circle . In this case , the string is the centripetal force . What is the line A F , fig . 13 , called ? What is ...
Page 58
... hand across this motion . This diagonal motion of the apple is called the resultant , or the resulting motion , because it is the effect , or result , of two motions , resolved into one . Perhaps this will be more ዉ- Fig . 34 . clear ...
... hand across this motion . This diagonal motion of the apple is called the resultant , or the resulting motion , because it is the effect , or result , of two motions , resolved into one . Perhaps this will be more ዉ- Fig . 34 . clear ...
Page 60
... hands , and with weights by which the whole is moved . The vibrations of the pendulum are numbered by a wheel having ... hand revolves once in every sixty beats of the pendulum , and as these beats are seconds , it goes round once in a ...
... hands , and with weights by which the whole is moved . The vibrations of the pendulum are numbered by a wheel having ... hand revolves once in every sixty beats of the pendulum , and as these beats are seconds , it goes round once in a ...
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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.