An Introduction to Natural Philosophy: Designed as a Text Book, for the Use of the Students[i]n Yale CollegeCollins & brother, 1844 - 592 Seiten |
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angle of incidence applied atmosphere attraction axis axle ball beam body center of gravity colors column common center concave concave lens condensed conductor consequently convex lens cycloid cylinder descend diameter diminished direction distance earth effect elastic electricity electrified electrometer equal equilibrium experiments fall feet fluid focus friction given glass greater Hence horizontal inches inclined plane increased insulated iron length lever Leyden jar light machine magnet mechanical miles mirror motion move Natural Philosophy needle object opposite parallel parallelogram particles passing pendulum perpendicular piston placed plate pole pounds pressure principle produced pulley quantity of matter radius ratio rays reflexion refraction represented resistance rest screw side sound space described specific gravity spherical aberration square steam string substance supposed surface telescope tion triangle tricity tube velocity vessel vibrations weight wheel
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Seite 139 - DB ; hence, (Art. 177,) the time of one vibration will be to the time of a body's falling freely down half the length of the pendulum, as the circumference of a circle to its diameter.
Seite 376 - The first seven letters of the alphabet, A, B, C, D, E, F, G, are...
Seite 381 - Nothing was ever written upon the subject of electricity, which was more generally read and admired in all parts of Europe than these Letters. There is hardly any European language into which they have not been translated; and, as if this were not sufficient to make them properly known, a translation of them has lately been made into Latin.
Seite 86 - MECHANICAL POWERS, are six in number; viz. 1. The Lever; 2. The Wheel and Axle ; 3. The Pulley ; 4. The Inclined Plane ; 5. The Screw; 6. The Wedge.
Seite 216 - ... 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...
Seite 526 - ... millionth part of a grain. But the density of light at the surface of the sun is greater than at the earth in the proportion of 45000 to 1 ; there ought, therefore, to issue from one square foot of the sun's surface, in one second of time, in order to supply the waste by light, one forty thousandth part of a grain of matter, — that is, a little more than two grains in a day, or about 4752000 grains, which is about 670 pounds, avoirdupois, in six thousand years...
Seite 140 - CIRCULAR arcs, is to the time down half the length of the pendulum, as the circumference of a circle to its diameter ; and therefore, within moderate limits, the time will be the same, whether the arc of vibration be larger or smaller.
Seite 202 - ADB; and the area of a circle is equal to the product of the radius into half the circumference.
Seite 365 - The distance to which sound may be heard, will of course vary with its force and various other circumstances which are incapable of being reduced to an exact law. Volcanoes, in South America, have sometimes been heard at the distance of three hundred miles ; and naval engagements have been heard at the distance of two hundred miles. The unassisted human voice has been heard from Old to New Gibraltar, a distance of ten or twelve miles, the watch-word, All's Well, given at the former place being heard...
Seite 183 - A man in a boat pulling a rope attached to a large ship, seems only to move the boat: but he really moves the ship a little, for...