A System of Natural Philosophy: In which the Principles of Mechanics, Hydrostatics, Hydraulics, Pneumatics, Acoustics, Optics, Astronomy, Electricity, Magnetism, Steam Engine, Electro-magnetism, Electrotype, Photography, and Daguerreotype, are Familiarly Explained, and Illustrated by More Than Two Hundred and Fifty Engravings : to which are Added Questions for the Examination of Pupils : Designed for the Use of Schools and Academies |
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A System of Natural Philosophy: In Which the Principles of Mechanics ... John Lee Comstock No preview available - 2016 |
A System of Natural Philosophy: In Which the Principles of Mechanics ... John Lee Comstock No preview available - 2016 |
A System of Natural Philosophy: In Which the Principles of Mechanics ... John Lee Comstock No preview available - 2015 |
Common terms and phrases
appear atmosphere attraction axis ball barrel body called centre of gravity centrifugal force circle colors concave mirror condenser consequently convergent convex lens convex mirror copper cylinder degrees diameter direction distance diurnal motion Earth eclipse effect electric fluid engine equal equator experiment Explain fig fall feet focus force fulcrum glass heat hence inches inclined plane increased instrument length lever machine magnet mercury meridian metal miles Moon motion move needle object obliquely orifice parallel particles pass pendulum perpendicular piece pipe piston planets plate poles position pounds pressure principle proportion pulley pump quantity of matter raised rays of light reflected refracted refracting telescope respect retina revolution revolve rope round screw seen side solar space specific gravity stars steam substances Sun and clock Sun's Suppose surface telescope thrown tion tube turned valve velocity vessel visual angle weight wheel wire
Popular passages
Page 243 - 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 147 - ... 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 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...
Page 93 - If the energy of the power be such as to raise the weight at the rate of one foot per minute, the weight may be moved in each minute through that length of the road which corresponds to a rise of one foot. Thus, if two roads rise one at the rate of a foot in fifteen feet, and the other at the rate of one foot in twenty feet, the same expenditure of power will move the weight through fifteen feet of the one, and twenty feet of the other at the same rate. From ' such considerations as these, it will...
Page 337 - M or Q,, according to the position of the magnetic poles, or the direction of the current, as already explained. In either case it is thrown out of the mercury, and the galvanic circuit being thus broken, the effect ceases until the wire falls back again by its own weight, and touches the mercury, when the current being again perfected, the same influence is repeated, and the wire is again thrown away from the mercury, and thus the vibratory motion becomes constant.
Page 147 - ... 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 board.
Page 317 - 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...
Page 84 - ... weight ascends, whatever this proportion may be, it is necessary that the power should have to the resistance the same ratio that the velocity of the resistance has to the velocity of the power. In other words, " The power multiplied by the space through which it moves, in a vertical direction, must be equal to the weight multiplied by the space through which it moves in a vertical direction.
Page 243 - Twins, the Crab, the Lion, the Virgin, the Scales, the Scorpion, the Archer, the Goat, the Waterer, and the Fishes. Fig. 183. The 12 signs of the zodiac, together with the sun, and the earth revolving around him, are represented at fig.
Page 186 - ... a ray of light passes obliquely from one medium into another of a different density, it is refracted...
Page 12 - ... and these, in their turn, form the nutriment of animals. Thus is there a perpetual change from death to life, and from life to death, and as constant a succession in the forms and places which the particles of matter assume. Nothing is lost; and not a particle of matter is struck out of existence. The same matter of which every living animal and every vegetable was formed in the earliest ages, is still in existence. As nothing...