Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended Chiefly for the Use of Students and Young Persons, Volume 1Longman, 1820 - Science |
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Common terms and phrases
angle appear Aries ASTRONOMY atmosphere attraction axis axle burning-glass called centre circle clouds colours comet concave mirror conductor consequently contrary converge convex convex lens degrees density diameter direction distance diurnal motion divergent earth ecliptic effect electric matter equal equator experiment EXPERIMENTAL PHILOSOPHY fall fixed stars fluid focus force glass globe gravity horizon hundred inches iron Jupiter law of Kepler lecture lens less lever luminous magnet means meridian metals minutes moon moon's motion move nature nearer object obliquely observed orbit parallax parallel pass phænomena phial piece piston planets plate poles pressure principle proportion pump quicksilver rays of light reflected refraction retina revolution rise round S.Porter sculp Saturn seen side sun's suppose surface telescope tides tion tube turn Uranus valve velocity Venus vessel Vesta Villejuif visible vitreous humour weight wind zodiac zodiacal light
Popular passages
Page 32 - ... that a body plunged in a fluid loses as much of its weight as is equal to the weight of an equal volume of the fluid.
Page 330 - ... 3°, it may be computed by proportional logarithms in the same manner as by common logarithms. If one of the terms be 3h or 3°, its proportional logarithm need not be considered in the operation, since it is equal to 0. Hence appears the use of proportional logarithms in finding Greenwich time from the distance of the moon from the sun or a fixed star. The variation of the distance in...
Page 330 - Ihould be taken from Two Stars, or the Sun and a Star on each Side of her, as often as Opportunity permits...
Page 169 - ABC sends out rays in all directions, some rays, from every point on the side next the eye, will fall upon the cornea between E and F; and by passing on through the humours and pupil of the eye, they will be converged to as many points on the retina or bottom of the eye, and will thereon form a distinct inverted picture cba of the object.
Page 77 - It comes on indiscriminately at any hour of the day, at any time of the tide, or at any period of the moon ; and continues sometimes only a day or two, sometimes five or six days, and has been occasionally known to last fifteen or sixteen days.
Page 190 - I thought the regular effects of the first prism would be destroyed by the second prism, but the irregular ones more augmented by the multiplicity of refractions. The event was that the light, which by the first prism was diffused into an oblong form, was by the second reduced into an orbicular one, with as much regularity as when it did not at all pass through them.
Page 163 - When the object is more remote from the mirror than its centre of concavity, C, the image will be less than the object, and between the object and the mirror ; when the object is nearer than the centre of concavity, the image will be more remote, and bigger than the object : thus, if...
Page 234 - C and screw a 6 are turned round by the winch A, the wheel D will be moved one tooth by the screw; and therefore, in 48 revolutions of the winch, the wheel D will be turned once rouncL Then, if the circumference of a circle described by the handle of...
Page 225 - A ed 3 times as far from the prop as the power P acts at F, by the cord C going over the fixed pulley D ; in this case, the power must be equal to three pounds, in order to support the weight.
Page 217 - Centre of gravity is that point of a body about which all its parts are in equilibria, or balance each other; and consequently, if this point be supported, the whole body will be at rest, and cannot fall. An imaginary line drawn from the centre of gravity of any body towards the centre of the earth is called the line of direction. Bodies...