Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly Explained |
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Page 89
... equator . Emily . But does not every part of the earth move with the same velocity ? Mrs. B. A moment's reflection would convince you of the contrary : a person at the equator must move quicker than one situated near the poles , since ...
... equator . Emily . But does not every part of the earth move with the same velocity ? Mrs. B. A moment's reflection would convince you of the contrary : a person at the equator must move quicker than one situated near the poles , since ...
Page 92
... equator , is the northern hemisphere ; that part to the south of the equator , the southern hemisphere . The small circle E F , which surrounds the north pole , is called the arctic circle ; that G H , which surrounds the south pole ...
... equator , is the northern hemisphere ; that part to the south of the equator , the southern hemisphere . The small circle E F , which surrounds the north pole , is called the arctic circle ; that G H , which surrounds the south pole ...
Page 93
... equator is rendered more conspicuous by its being described on the same globe ; and the obliquity of the eclip- tic shows how much the earth's axis is inclined to the plane of its orbit . But to return to fig . 2. plate 8 . The spaces ...
... equator is rendered more conspicuous by its being described on the same globe ; and the obliquity of the eclip- tic shows how much the earth's axis is inclined to the plane of its orbit . But to return to fig . 2. plate 8 . The spaces ...
Page 94
... equator and the ecliptic , are called greater circles ; to distinguish them from those which divide it into two ... equator to one of the poles ? Caroline . The equator being equally distant from either pole , that distance must be half ...
... equator and the ecliptic , are called greater circles ; to distinguish them from those which divide it into two ... equator to one of the poles ? Caroline . The equator being equally distant from either pole , that distance must be half ...
Page 95
... equator , must then be of the same dimensions , with a degree of latitude . Mrs. B. They would , were the earth a perfect sphere ; but it is not exactly such , being somewhat protuberant about the equator , and flattened towards the ...
... equator , must then be of the same dimensions , with a degree of latitude . Mrs. B. They would , were the earth a perfect sphere ; but it is not exactly such , being somewhat protuberant about the equator , and flattened towards the ...
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Common terms and phrases
angle appear atmosphere axis ball called camera obscura Caroline cause centre of gravity circle concave mirror convex convex lens degrees diminished direction distance diurnal motion earth eclipses effect elastic Emily equal equator equilibrium equinox fixed stars fluid focus force fulcrum glass globe greater heat inclined plane length lens lever liquid longitude luminous body magnified meant mechanical power mercury meridian moon motion move nature object obliquely observe opaque body orbit parallel particles passing perfectly perpendicular planets plate 14 poles pressure produced properties proportion pulley pump quantity of matter rays fall rays of light reflected rays refracted represented resistance retina revolution revolve round rise round the sun screw shadow shine situated solar solid bodies sonorous body sound space specific gravity sphere spring sun's rays suppose surface tides tion tube understand vapour velocity vernal equinox vibrations weight wheel whilst wind zone
Popular passages
Page 82 - Now came still Evening on, and Twilight gray had in her sober livery all things clad : Silence accompanied ; for Beast and Bird, they to their grassy couch, these to their nests, were slunk, — all but the wakeful nightingale; she, all night long, her amorous descant sung; Silence was pleased. Now...
Page x - IDE, of the said District, hath deposited in this office, the title of a book, the right whereof he claims as proprietor, in the words following, to wit : " Inductive Grammar, designed for beginners. By an Instructer." In conformity to the act of the Congress of the United States...
Page 84 - Their names are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricornus, Aquarius, Pisces; the whole occupying a complete circle, or broad belt, in the heavens, called the zodiac, (plate 8.
Page 64 - ... time that the axle describes a small one, therefore the power is increased in the same proportion as the circumference of the wheel is greater than that of the axle. If the velocity of the wheel is...
Page 196 - The effect of a concave lens is, you know, exactly the reverse of a convex one: it renders parallel rays divergent, and those which are already divergent, still more so. By the assistance of such glasses, therefore, the rays from a distant object fall on the pupil, as divergent as those from a less distant object; and, with short-sighted people, they throw the image of a distant object back as far as the retina. Caroline. This is an excellent contrivance, indeed. Mrs.
Page 67 - ... perfect smoothness or evenness in nature: polished metals, though they wear that appearance, more than any other bodies, are far from really possessing it; and their inequalities may frequently be perceived through a good magnifying glass. When, therefore, the surfaces of the two bodies come into contact, the prominent parts of the.
Page 36 - ... is continually increased. When a stone falls from a height, the impulse which it receives from gravity during the first instant of its fall, would be sufficient to bring it to the ground with a uniform velocity : for, as we have observed, a body having been once acted...
Page 73 - ... 1, 2, 3, 4, &c. all of which are of equal dimensions, though of very different forms ; some of them, you see, are long and narrow, others broad and short : but they each of them contain an equal quantity of space. An imaginary line drawn from the centre of the earth to that of the sun, and keeping pace with the earth in its revolution, passes over equal areas in equal times ; that is to say, if it is a month going from A to B, it will be a month going from B to C, and another from C to E, and...
Page 50 - The curve-line which the ball has described, is called in geometry, a parabola; but when the ball is thrown perpendicularly upwards, it will descend perpendicularly ; because the force of projection, and that of gravity, are in the same line of direction. We have noticed the centres of magnitude, and of motion ; but I have not yet explained to you what is meant by the centre of gravity ; it is that point in a body, about which all the parts exactly balance each other ; if, therefore, that point is...
Page 72 - A* (fig. 3.) its projectile force should not have given it a velocity sufficient to counterbalance that of gravity, so as to enable these powers conjointly to carry it round the sun in a circle; the earth, instead of describing the line AC, as in the former figure, will approach nearer the sun in the line A B.