Conversations on Natural Philosophy: In which the Elements of that Science are Familiarly ExplainedJohn Grigg, 1826 - 220 من الصفحات |
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الصفحة xi
... move round it . - Centre of Magnitude , the middle of a body . - Centripetal Force , that which impels a body towards a fixed eentral point . - Centrifugal Force , that which impels a body to fly from the centre . - Fall of Bodies in a ...
... move round it . - Centre of Magnitude , the middle of a body . - Centripetal Force , that which impels a body towards a fixed eentral point . - Centrifugal Force , that which impels a body to fly from the centre . - Fall of Bodies in a ...
الصفحة 14
... move , therefore , it must be stopped by some other cause or power ; but as it is one with which you are yet unacquainted , we can not at present investigate its effects . The last property which appears to be common to all bodies is ...
... move , therefore , it must be stopped by some other cause or power ; but as it is one with which you are yet unacquainted , we can not at present investigate its effects . The last property which appears to be common to all bodies is ...
الصفحة 24
... moved , when they are so firmly fixed in the ground ! Mrs. B. Emily's question is not absurd , and your answer , Ca- 5. If attraction is the cause of weight , could you suppose it possible for a body to possess the former and not the ...
... moved , when they are so firmly fixed in the ground ! Mrs. B. Emily's question is not absurd , and your answer , Ca- 5. If attraction is the cause of weight , could you suppose it possible for a body to possess the former and not the ...
الصفحة 25
... move towards the hills and the mountains ; but the lesser force must yield to the greater . There are , however , some circumstances in which the attraction of a large body has sensibly counteracted that of the earth . If whilst ...
... move towards the hills and the mountains ; but the lesser force must yield to the greater . There are , however , some circumstances in which the attraction of a large body has sensibly counteracted that of the earth . If whilst ...
الصفحة 26
... move laterally , and that they will not fall unless impelled by some force ; now this force must be proportioned to the quantity of matter it has to move : a body consisting of 1000 particles of matter , for instance , requires ten ...
... move laterally , and that they will not fall unless impelled by some force ; now this force must be proportioned to the quantity of matter it has to move : a body consisting of 1000 particles of matter , for instance , requires ten ...
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عبارات ومصطلحات مألوفة
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
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الصفحة 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...
الصفحة 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...
الصفحة 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.
الصفحة 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...
الصفحة 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.
الصفحة 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.
الصفحة 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...
الصفحة 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...
الصفحة 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...
الصفحة 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.