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angle of incidence applied axis axle ball beam body center of gravity colors column common center concave concave lens condensed conductor consequently convex lens curve cycloid cylinder descend diameter diminished direction distance earth effect elastic electricity electrified electrometer equal equilibrium experiments fall feet fluid focus forces acting friction given glass greater Hence horizontal inches inclined plane increased insulated length less lever Leyden jar light machine magnet manner mechanical microscope miles mirror motion move Natural Philosophy object opposite parallelogram particles passing pendulum perpendicular piston placed plate pounds pressure principle produced proportion pulley quantity of matter radius ratio reflexion refracting telescopes refraction represented resistance rest screw side sine sound space described specific gravity spherical aberration square steam string supposed surface sustained telescope tion triangle tube velocity vessel vibrations weight wheel
Page 503 - When one medium is a vacuum, n is the ratio of the sine of the angle of incidence to the sine of the angle of refraction. retardation, S — optical path difference between two beams in an interferometer; also known as "optical path difference
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 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 339 - The resistance which is opposed to a pump rod in raising water, is ~equal to the weight of a column of water whose base is the area of the piston, and...
Page 502 - Thus, inflammable bodies, as sulphur, amber, and essential'oils, have a very great refracting power in comparison with other bodies ; and in a given instance, a ray of light in passing out of one of these substances into another of greater density but of less refractive power, might not be turned toward, but from, the perpendicular.
Page 376 - The first seven letters of the alphabet, A, B, C, D, E, F, G, are...
Page 133 - CD=velocity down FD=velocity down FG ; ie the whole velocity acquired by a body falling down successive planes, is equal to the velocity which a body would acquire in falling freely through their joint height FG.
Page 521 - The intensity declines rapidly to M, and slowly to N, at both of which points it vanishes. The yellow spectrum has its maximum intensity at Y, the intensity declining to zero at M and N ; and the blue has its maximum intensity at B, declining to nothing at M and N. The general curve which represents the total illumination at any point will be outside these three curves, and its ordinate at any point will be equal to the sum of three ordinates at the same point.
Page 114 - The pulley is a small wheel, movable about its axis by means of a cord, which passes over it. When the axis of a pulley is fixed, the pulley only changes the direction of the power ; if movable pulleys are used, an equilibrium is produced, when the power is to the weight, as one to the number of ropes applied to them.