A System of Natural Philosophy: in which are Explained the Principles of Mechanics, Hydrostatics, Hydraulics, Pneumatics, Acoustics, Optics ...: Illus. by Three Hundred Engravings

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Pratt, Woodford, and Company, 1852 - 408 sider
 

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Side 308 - The vicissitudes of the seasons are caused by the annual revolution of the earth round the sun, together with the inclination of its axis to the plane of its orbit. 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 the inclination of the lines crossing the earth, and the obliquity of the orbits of the other planets, are to be estimated.
Side 372 - This is strikingly shown in an alloy called the " fusible metal," which is composed of 8 parts of bismuth, 5 of lead, and 3 of tin, and melts at 203° F.
Side 159 - It was in a southern latitude. The sun had just set with placid appearance, closing a beautiful afternoon, and the usual mirth of the evening watch was 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...
Side 284 - The names of the 12 signs of the zodiac are, Aries, Taurus, Gemini, Cancer, Leo, Virgo; Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.
Side 327 - 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...
Side 222 - The transparent body through which the light passes is called the medium, and it is found in all cases, that where a ray of light passes obliquely from one medium into another of a different density, it is refracted, or turned out of its former course.
Side 283 - 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.
Side 203 - And they placed them on the heavenly tablets, each had thirteen weeks; from one to another (passed) their memorial, from the first to the second, and from the second to the third, and from the third to the fourth.
Side 159 - ... 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...
Side 165 - ... or collar of leather. A crank is applied to the end to turn it, and as one wheel revolves, it necessarily turns the other ; the direction of their motions being indicated by the arrows. The water that...

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