A System of Natural Philosophy, in which the Principles of Mechanics, Hydrostatics, Hydraulics [etc.] are Familiarly Explained: To which are Added Questions for the Examination of the Pupils ...Robinson, Pratt & Company, 1835 |
Términos y frases comunes
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 experiment Explain fig falling body feet filled fluid fulcrum glass greater heat hence hydrometer illustrated inches inclined plane increased instrument kind of lever length less machine magnetic mercury meridian metals miles moon motion move object 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 solar space specific gravity substances sun's Suppose surface suspended telescope thrown tion tube turned upwards valve velocity vessel vibrations visual angle weight
Pasajes populares
Página 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 times therein mentioned ;
Página 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...
Página 206 - The names of the 12 signs of the zodiac are, Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. The...
Página 236 - ... 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...
Página 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 others imagine that they are of a more permanent...
Página 130 - ... 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. Nothing could withstand it; the sails already furled and closely bound to the yards, were riven away in tatters; even the bare...
Página ii - Wilson, of the said district, hath deposited in this office the title of a book, the right whereof he claims as author and proprietor, in the words following...
Página 205 - 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, etc.
Página 260 - ... degrees. Did the planes of the orbits of the earth and moon coincide, there would be an eclipse of the moon at every full, for then the moon would pass exactly through the earth's shadow.
Página 197 - From this it is evident that, if the eye of the spectator is moved to another position, he will not see the red ray coming from the same drop of rain, but only the blue, and if to another position, the green, and so of all the others. But in a shower of rain, there are drops at all heights and distances, and though they perpetually change their places, in respect to the sun and the eye, as they fall, still there will be many which will be in such a position as to reflect the red rays to the. eye,...