A System of Natural Philosophy: In which the Principles of Mechanics, Hydrostatics, Hydraulic, Pneumatics, Acoustics, Optics, Astronomy, Electricity, Magnetism, Steam Engine, and Electro-magnetism, are Familiarly Explained, and Illustrated by More Than Two Hundred Engravings. To which are Added Questions for the Examinations of Pupils ...Robinson, Pratt & Company, 1813 - 340 σελίδες |
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Σελίδα
... means of diagrams , knows that the great number of letters of reference with which they are sometimes loaded , is often the most perplexing part of the subject , and particularly when one figure is made to an- swer several purposes ...
... means of diagrams , knows that the great number of letters of reference with which they are sometimes loaded , is often the most perplexing part of the subject , and particularly when one figure is made to an- swer several purposes ...
Σελίδα
... means penetrated by the nail . } 5. When a piece of gold is dissolved in an acid , the par- ticles of the metal are divided , or separated from each other , and diffused in the fluid , but the particles of gold are suppo- sed still to ...
... means penetrated by the nail . } 5. When a piece of gold is dissolved in an acid , the par- ticles of the metal are divided , or separated from each other , and diffused in the fluid , but the particles of gold are suppo- sed still to ...
Σελίδα 1
... mean that a body may be divided into parts , and that these parts may again be divided into other parts . ) 11. It ... means in our power . But under what circumstances this takes place , or whether it is in the power of man during his ...
... mean that a body may be divided into parts , and that these parts may again be divided into other parts . ) 11. It ... means in our power . But under what circumstances this takes place , or whether it is in the power of man during his ...
Σελίδα 2
... means passiveness or want of When bodies suffer decay , are their particles lost ? What becomes of the particles of ... mean ? power . Thus matter is , of itself , equally 12 PROPERTIES OF BODIES .
... means passiveness or want of When bodies suffer decay , are their particles lost ? What becomes of the particles of ... mean ? power . Thus matter is , of itself , equally 12 PROPERTIES OF BODIES .
Σελίδα 3
... the ice than on the ground ? What does this prove ? Why , with the same force of projection , will a ball move farther through the air than on the ice ? means of an air pump , and a common top PROPERTIES OF BODIES . 13.
... the ice than on the ground ? What does this prove ? Why , with the same force of projection , will a ball move farther through the air than on the ice ? means of an air pump , and a common top PROPERTIES OF BODIES . 13.
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Συχνά εμφανιζόμενοι όροι και φράσεις
16 feet angle appear ascertained atmosphere attraction ball body falls brittleness called centre of gravity centrifugal force centripetal force circle colours concave consequence convex lens convex mirror cylinder degrees descend diameter direction distance earth earth's axis earth's orbit eclipse elastic engine equal equator equinox Explain fig falling body fixed stars fulcrum glass heat Herschel inch inclined inclined plane increased length lens lever machine magnet mercury meridian miles moon motion move needle object orbit orifice particles pass pendulum perpendicular piece piston planets poles pounds pressure principle proportion pulley pump quantity rays of light reflected reflecting telescope refracted respect retina revolution revolve round row expresses Saturn screw seen side solar space specific gravity square steam substances sun and clock sun's Suppose surface telescope thrown tion tube upper valve velocity vessel visual angle weight wheel wire
Δημοφιλή αποσπάσματα
Σελίδα 161 - 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.
Σελίδα 171 - Different opinions have been advanced by astronomers respecting the cause of these appearances. By some, they have been regarded as clouds, or as openings in the atmosphere of the planet, while others imagine that they are the marks of great natural changes, or revolutions, which are perpetually agitating the surface of that planet. It is, however, most probable, that these appearances are produced by the agency of some cause, of which we, on this little earth, must always be entirely ignorant.
Σελίδα 121 - Lens is a transparent body, generally made of glass, and si shaped that the rays of light in passing through it are either collected together or dispersed. Lens is a Latin word, which comes from lentile, a small flat bean. It has already been shown, that when the rays of light pass from a rarer to a denser medium, they are refracted, or bent out of their former course, except when they happen to fall perpendicularly on the surface of the medium.
Σελίδα 23 - Thus, a tall body, shaped like fig. 27, will fall, if it. leans but very slightly, for the centre of gravity being far above the base, at a, is brought over the centre of motion, b,with little inclination, as shown by the plumb line.
Σελίδα 211 - The moon always presents the same face to us, by which it is evident that she turns but once upon her axis, while she performs a revolution round the earth ; so that the inhabitants of the moon have but one day and one night in the course of a lunar month. Since we always see the same hemisphere of the moon, the inhabitants of that hemisphere alone can see the earth.
Σελίδα 251 - 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.
Σελίδα 236 - 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...
Σελίδα 161 - The names of the 12 signs of the zodiac are, Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. The...
Σελίδα 69 - ... 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...
Σελίδα 139 - REFRACTING TELESCOPE. — The most simple refracting telescope consists of a tube, containing two convex lenses, the one having a long, and the other a short, focal distance. (The focal distance of a double convex lens, it will be remembered, is nearly the centre of a sphere, of which it is a part.) These two lenses are placed in the tube, at a distance from each other equal to the sum of their two focal distances. Fig.