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angle angle of incidence applied atmosphere axis axle ball beam body center of gravity colors common condensed conductor consequently convex convex lens cycloid cylinder descend diameter diminished direction distance earth effect elastic electricity electrified electrometer equal equilibrium experiments fall feet fluid force friction given glass greater heat Hence horizontal inches inclined plane increased iron length lens less lever Leyden jar light machine magnet mechanical mechanical advantage miles mirror motion move Natural Philosophy needle object opposite orifice parallel particles passing pendulum perpendicular pipe piston placed pole portion pounds pressure principle produced pulley quantity quicksilver radius ratio rays reflexion refracting telescopes refraction represented resistance rest screw side solid sound space described specific gravity spherical aberration square steam string substance supposed surface temperature tion triangle tricity tube valve velocity vessel vibrations weight wheel
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 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...