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
... WIND AND SOUND . 146 Of Wind in General .--- Of the Trade Wind .--- Of the Periodical Trade Winds .--- Of the Aerial Tides .--- Of Sound in General .--- Of Sonorous Bo- dies .--- Of Musical Sounds .--- Of Concord or Harmony , and Melody ...
... WIND AND SOUND . 146 Of Wind in General .--- Of the Trade Wind .--- Of the Periodical Trade Winds .--- Of the Aerial Tides .--- Of Sound in General .--- Of Sonorous Bo- dies .--- Of Musical Sounds .--- Of Concord or Harmony , and Melody ...
الصفحة 66
... wind , to turn the wheel . One of the great benefits resulting from the use of machinery is , that it gives us a sort of empire over the powers of nature , and enables us to make them perform the labour which would otherwise fall to the ...
... wind , to turn the wheel . One of the great benefits resulting from the use of machinery is , that it gives us a sort of empire over the powers of nature , and enables us to make them perform the labour which would otherwise fall to the ...
الصفحة 67
... wind it round your pencil , which will 50. Why is it rather a compound than a simple power ? 51. What com- mon instruments act upon the principle of the inclined plane , or the wedge ? 52. Why does a knife cut best when drawn across ...
... wind it round your pencil , which will 50. Why is it rather a compound than a simple power ? 51. What com- mon instruments act upon the principle of the inclined plane , or the wedge ? 52. Why does a knife cut best when drawn across ...
الصفحة 68
... winds up or down ; then observe , that the closer the threads of the screw , the less is its ascent in turning round , and the greater is its power ; so that we return to the old principle , - what is saved in power is lost in time ...
... winds up or down ; then observe , that the closer the threads of the screw , the less is its ascent in turning round , and the greater is its power ; so that we return to the old principle , - what is saved in power is lost in time ...
الصفحة 88
... wind , you would not perceive that you moved , for you could not feel it , and you could see it only by observing the change of place of the objects on shore . So it is with the motion of the earth : every thing on its surface , and the ...
... wind , you would not perceive that you moved , for you could not feel it , and you could see it only by observing the change of place of the objects on shore . So it is with the motion of the earth : every thing on its surface , and the ...
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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.