The Elements of Physics |
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Page 146
... heat in a vertical direction is much less interrupted than in an oblique di- rection . It is owing to the heat lost in consequence of the oblique incidence of the sun's rays that the inhabitants of 146 CHAP . VI . ELEMENTS OF PHYSICS .
... heat in a vertical direction is much less interrupted than in an oblique di- rection . It is owing to the heat lost in consequence of the oblique incidence of the sun's rays that the inhabitants of 146 CHAP . VI . ELEMENTS OF PHYSICS .
Page 147
Thomas Webster. oblique incidence of the sun's rays that the inhabitants of our latitudes receive so much less heat in winter than in summer , although the earth is much nearer the sun at the former than at the latter period . There is a ...
Thomas Webster. oblique incidence of the sun's rays that the inhabitants of our latitudes receive so much less heat in winter than in summer , although the earth is much nearer the sun at the former than at the latter period . There is a ...
Page 196
... incidence . The obstacle will be the origin of a new vibratory motion in the air ; it will be the centre of new waves which can cross without disturbing the former ; just as we know the waves of still water can cross each other , when ...
... incidence . The obstacle will be the origin of a new vibratory motion in the air ; it will be the centre of new waves which can cross without disturbing the former ; just as we know the waves of still water can cross each other , when ...
Page 197
... incidence and reflection are equal , every ray of sound proceeding from this point on the axis is re- flected in one and the same direction , namely , parallel to the axis of the parabola . If therefore the mouth of the speaker be in ...
... incidence and reflection are equal , every ray of sound proceeding from this point on the axis is re- flected in one and the same direction , namely , parallel to the axis of the parabola . If therefore the mouth of the speaker be in ...
Page 255
... incidence . Light , as we shall see hereafter , obeys in this respect precisely the same laws ; and it is found , that if any warm body be placed in the focus of a parabolic mirror , the rays will be reflected parallel to the axis ...
... incidence . Light , as we shall see hereafter , obeys in this respect precisely the same laws ; and it is found , that if any warm body be placed in the focus of a parabolic mirror , the rays will be reflected parallel to the axis ...
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action angle angle of incidence appears atmosphere attraction axis ball body cause centre of gravity colours column conductor consequently considered convex lens crystal crystalline lens density direction distance double refraction earth effect elastic force electricity electromotive force equal equilibrium evaporation exerted exist experiments fluid glass greater hence inches incidence instance intensity iron isochronism laws length lens less light liquid luminous magnetic mass mercury metal mirror motion moving nature needle object observed ordinary ray orifice oscillation parallel particles passes pencil pendulum perpendicular phenomena plane poles portion position preceding pressure principles prism produced propagated properties rays reflected reflexion refraction remarkable resinous seen sensible shew shewn side solid sound space spectrum string substance suppose surface takes place temperature theory thermometer tion tricity tube vapour velocity vessel vibrations violet vitreous vitreous fluid wave weight zinc
Popular passages
Page 16 - ... it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, movable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which He formed them; and that these primitive particles, being solids, are incomparably harder than any porous bodies compounded of them, even so very hard as never to wear or break in pieces — no ordinary power being able to divide what God himself made...
Page 15 - All these things being consider'd, it seems probable to me, that God in the Beginning form'd Matter in solid, massy, hard, impenetrable, moveable Particles, of such Sizes and Figures, and with such other Properties, and in such Proportion to Space, as most conduced to the End for which he form'd them...
Page 359 - Every ray of light in its passage through any refracting surface, is put into a certain transient constitution or state; which, in the progress of the ray, returns at equal intervals, and disposes the ray at every return to be easily transmitted through the next refracting surface ; and between the returns to be easily reflected by it.
Page 280 - The immediate cause of the phenomena of heat, then, is motion, and the laws of its communication are precisely the same as the laws of the communication of motion.
Page 281 - ... greatest in the last, the particles have a motion round their own axes, with different velocities, the particles of elastic fluids moving with the greatest quickness ; and that in...
Page 360 - ... hot; that the vibrations thus excited are propagated in the refracting or reflecting medium or substance, much after the manner that vibrations are propagated in the air for causing sound, and move faster than the rays so as to overtake them...
Page 91 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.
Page 16 - Particles continue entire, they may compose Bodies of one and the same Nature and Texture in all Ages: But should they wear away, or break in pieces, the Nature of Things depending on them, would be changed. Water and Earth composed of old worn Particles and Fragments of Particles, would not be of the same Nature and Texture now, with Water and Earth composed of entire Particles, in the Beginning. And therefore that Nature may be lasting, the Changes of corporeal Things are to be placed only in the...
Page 281 - It seems possible to account for all the phenomena of heat, if it be supposed that in solids the particles are in a constant state of vibratory motion, the particles of the hottest bodies moving with the greatest velocity and through the greatest space ; that in...
Page 490 - ... some of those innumerable beautiful productions it casts up with lavish prodigality, but whose acquisition can be regarded as no diminution of the treasures that remain.