An Easy Grammar of Natural and Experimental Philosophy: For the Use of SchoolsKimber & Conrad; W. Brown, printer, 1811 - 152 |
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Strona 36
... appears , that the longer the winch or lever , and the nearer the spirals , the more advantage is gained . 93. A screw may be moved upward or downward in a fixed nut , as in fig . 22 , or the hut may move on the screw , as in fig . 23 ...
... appears , that the longer the winch or lever , and the nearer the spirals , the more advantage is gained . 93. A screw may be moved upward or downward in a fixed nut , as in fig . 22 , or the hut may move on the screw , as in fig . 23 ...
Strona 53
... appears that the weight of the atmosphere is variable , and the above mentioned tube filled with quicksilver has , from its showing the actual weight of the at- mosphere , been called a barometer . 167. The most usual altitude of the ...
... appears that the weight of the atmosphere is variable , and the above mentioned tube filled with quicksilver has , from its showing the actual weight of the at- mosphere , been called a barometer . 167. The most usual altitude of the ...
Strona 56
... appear to boil when the air is nearly exhausted from the glass . 11. The smoke of a candle will ascend in the air , but in an exhausted receiver it will fall to the bottom , which shows that it generally ascends because it is lighter ...
... appear to boil when the air is nearly exhausted from the glass . 11. The smoke of a candle will ascend in the air , but in an exhausted receiver it will fall to the bottom , which shows that it generally ascends because it is lighter ...
Strona 72
... appear of a dirty ish white . If the colours were more perfect and accurately defined , the white would be more perfect also . 241. The seven colours are reducible to three , viz . the red , the blue , and the yellow . 242. The most ...
... appear of a dirty ish white . If the colours were more perfect and accurately defined , the white would be more perfect also . 241. The seven colours are reducible to three , viz . the red , the blue , and the yellow . 242. The most ...
Strona 74
... appear feint and indis- tinct . 252. Spectacles are intended to assist the sight of those whose eyes are either too round or too flat . 253. Concave glasses are necessary to those whose eyes are too round . Illustration . When the eye ...
... appear feint and indis- tinct . 252. Spectacles are intended to assist the sight of those whose eyes are either too round or too flat . 253. Concave glasses are necessary to those whose eyes are too round . Illustration . When the eye ...
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advantage gained angle angle of incidence appear atmosphere attraction battery body brass called camera obscura candle centre of gravity circle coats colours communication converge convex lens cylinder diameter diurnal motion earth eclipse elastic electric fluid electrified equal Example Experiment Explain eye-glass fall fixed focal distance focus force fulcrum galvanic glass tube Herschel horizon hydrostatical Illustration inches inclined plane kind of lever length line of direction machine magnetic needle means meant mechanical powers mercury meridian metal mirror moon motion move north pole object orbits parallel rays particles pass pendulum perpendicular phial piece pipe piston placed planets plate poles pounds pressure prime conductor proportion pulley quantity quicksilver rays of light reflected refracting telescope refraction repel retina round screw side space specific gravities stars substances surface telescope tion velocity Venus vessel Vesta vibrations weight
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Strona 2 - Co. of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit : " Tadeuskund, the Last King of the Lenape. An Historical Tale." In conformity to the Act of the Congress of the United States...
Strona 65 - ... and, consequently, the heat at the focus is to the common heat of the sun, as the area of the glass is to the area of the focus. Thus, if a lens, four inches in diameter, collect the sun's rays into a focus, at the distance of twelve inches, the image will not be more than...
Strona 28 - ... them. Here the power must exceed the weight in the same proportion as the distance of the weight from the prop exceeds the distance of the power.
Strona 70 - And if he hold out his hand towards the mirror, the hand of the image will come out towards his hand, and coincide with it, of an equal bulk, when his hand is in the centre of concavity; and he will imagine he may shake hands with his image.
Strona 63 - If the medium which the rays enter be denser, they move through it in a direction nearer to the perpendicular drawn to its surface. On the contrary, when light passes out of a denser into a rarer medium, it moves in a direction farther from the perpendicular. This refraction is greater or less — that is, the rays are more or less bent, or turned aside from their course — as the second medium through which they pass is more or less dense than the first. To prove this in a satisfactory...
Strona 19 - UB, be drawn parallel to them, so as to complete the parallelogram, then the line which the body A will describe will be in the diagonal AD, and the length of this line will represent the force with which the body will move.
Strona 54 - That upon very great winds, though they be not accompanied with rain, the mercury sinks lowest of all, with relation to the point of the compass the wind blows upon.
Strona 81 - C to all parts of the glass, and each plane surface will refract these rays to the eye, the same object will appear to the eye, in the direction of the rays which enter it through each surface. Thus, a ray...
Strona 43 - The pressure of a fluid upon any given part of the bottom or sides of a vessel is equal to the weight of a column of that fluid, having a base equal to that part of the bottom or side, and an altitude equal to the perpendicular height of the fluid above it.
Strona 23 - If a line be drawn from the centre of gravity of a body perpendicular to the horizon, it is called the line of direction, because it is the line that the centre of gravity would describe if the body fell freely.