# An Introduction to Natural Philosophy: Designed as a Text Book, for the Use of the Students[i]n Yale College

Collins & brother, 1844 - 592 pages

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Page 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.
Page 376 - The first seven letters of the alphabet, A, B, C, D, E, F, G, are...
Page 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.
Page 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.
Page 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...
Page 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...
Page 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.
Page 202 - ADB; and the area of a circle is equal to the product of the radius into half the circumference.
Page 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...
Page 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...