An Easy Grammar of Natural and Experimental Philosophy: For the Use of SchoolsKimber & Conrad; W. Brown, printer, 1811 - 152 страници |
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Страница 33
... horizon , and is used to raise weights from one level to ano- ther , fig . 20 . 81. It is often made by placing boards , or earth , in a sloping direction , and is of great importance in rolling up heavy bodies , as casks , wheel ...
... horizon , and is used to raise weights from one level to ano- ther , fig . 20 . 81. It is often made by placing boards , or earth , in a sloping direction , and is of great importance in rolling up heavy bodies , as casks , wheel ...
Страница 34
... horizon as A D , fig . 20 , and three times the length of the perpendicular D B , the cylinder E will be supported by a power equal to a third part of its weight . 83. The advantage gained by this mecha- nical power is in proportion as ...
... horizon as A D , fig . 20 , and three times the length of the perpendicular D B , the cylinder E will be supported by a power equal to a third part of its weight . 83. The advantage gained by this mecha- nical power is in proportion as ...
Страница 42
... horizon , and will remain at rest . Experiment . If a vessel , fig . 24 , consist of pipes vari ously inclined , communicating with each other at B , and open at the top , water poured into any one of them will rise to the same level in ...
... horizon , and will remain at rest . Experiment . If a vessel , fig . 24 , consist of pipes vari ously inclined , communicating with each other at B , and open at the top , water poured into any one of them will rise to the same level in ...
Страница 82
... horizon is that apparent circle which on an extensive plane seems to circumscribe our sphere of vision . 283. The rational horizon divides the hea- vens into two equal parts or hemispheres ; the visible which is above , and the ...
... horizon is that apparent circle which on an extensive plane seems to circumscribe our sphere of vision . 283. The rational horizon divides the hea- vens into two equal parts or hemispheres ; the visible which is above , and the ...
Страница 83
... horizon , and crosses the meridian every day at a different point ; but never goes farther from the equator than about 23 ° 28 ' , either towards the north or towards the south of it . 291. The ecliptic is the Sun's apparent annual path ...
... horizon , and crosses the meridian every day at a different point ; but never goes farther from the equator than about 23 ° 28 ' , either towards the north or towards the south of it . 291. The ecliptic is the Sun's apparent annual path ...
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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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Страница 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...
Страница 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...
Страница 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.
Страница 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.
Страница 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...
Страница 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.
Страница 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.
Страница 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...
Страница 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.
Страница 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.