The Elements of Acoustics, Light, and Heat |
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Page viii
... winds . He ought to be able to explain the Trade Winds . The constancy of the co - efficient of expansion of gases ought to be pointed out , with the small deviations from the general rule exhibited by carbonic and sulphurous acids ...
... winds . He ought to be able to explain the Trade Winds . The constancy of the co - efficient of expansion of gases ought to be pointed out , with the small deviations from the general rule exhibited by carbonic and sulphurous acids ...
Page 3
... wind are neglected . ( See Exercise I ) It must be borne in mind that it is neither the elas- ticity nor the density alone that affects velocity , but the two together , according to the relation which exists between them , and in ...
... wind are neglected . ( See Exercise I ) It must be borne in mind that it is neither the elas- ticity nor the density alone that affects velocity , but the two together , according to the relation which exists between them , and in ...
Page 9
... wind blows from the hearer to- wards the sounding body , the sound , which would be distinctly audible in a calm , often ceases to be heard . The undulations of sound - waves are also obstructed by the falling of rain or snow . In cold ...
... wind blows from the hearer to- wards the sounding body , the sound , which would be distinctly audible in a calm , often ceases to be heard . The undulations of sound - waves are also obstructed by the falling of rain or snow . In cold ...
Page 10
... wind must be taken into calculation , and the moisture of the atmosphere must be considered . The velocity of light , being so immense , may be ignored for such distances as are available for acoustical ex- periment . A pistol is fired ...
... wind must be taken into calculation , and the moisture of the atmosphere must be considered . The velocity of light , being so immense , may be ignored for such distances as are available for acoustical ex- periment . A pistol is fired ...
Page 15
... wind - chest two organ pipes of the same pitch , they will so influence each other that the wind at the moment of leaving one pipe will enter the other ; the depression of one wave thus produced will coincide with the elevation of the ...
... wind - chest two organ pipes of the same pitch , they will so influence each other that the wind at the moment of leaving one pipe will enter the other ; the depression of one wave thus produced will coincide with the elevation of the ...
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Common terms and phrases
aberration able to describe achromatic ACOUSTICS amount of heat angle apparatus appear aqueous humour atmosphere axis body boiling point bulb called candle carbon centigrade centre chromatic aberration co-efficient colours combustion condensation convex convex lens cubic density direction disc distance elasticity equal EXERCISE expansion experiment explain fall gases give glass gridiron pendulum inches increase instrument intensity inverted iron know regarding latent heat length lens lenses lines liquid mercury metal motion musical nodal lines number of vibrations object optical ordinary particles pass pipe placed plane mirrors plate polarized position pressure principal focus prism produced pupil radiation raised ray of light reflecting telescope reflector refraction retina rise screen seen solid sound-wave specific heat spectrum spherical spherical aberration steam string substance surface telescope temperature theory thermometer tion tourmaline tube tuning-fork vapour velocity of sound vessel volume waves weight white light winds
Popular passages
Page 155 - The third specific difference is this; that heat is a motion of expansion, not uniformly of the whole body together, but in the smaller parts of it ; and at the same time checked, repelled, and beaten back, so that the body acquires a motion alternative, perpetually quivering, striving and struggling, and irritated by repercussion, whence springs the fury of fire and heat.
Page 156 - Heat is a motion, expansive, restrained, and acting in its strife upon the smaller particles of bodies. But the expansion is thus modified: while it expands all ways, it has at the same time an inclination upwards. And the struggle in the particles is modified also: it is not sluggish, but hurried and with violence.
Page 82 - ... that every ray of white light may be separated into seven primary colours : red, orange, yellow, green, blue, indigo, and violet — that the variegated colouring which appears on the face of nature is not in the objects themselves, but in the light which falls upon them — that the rainbow is produced by the refraction and reflection of the solar rays in the drops of falling rain — that the rays of light are refracted, or bent out of their course, when they fall upon glass, water, and other...
Page 116 - The same unanimity has not prevailed either as respects the unit or the thermometric zero. In England, Holland, some of the German States, and in North America, the interval between the freezing and boiling points is divided into 180 equal parts, each part representing the thermometric unit. The scale is continued by equal divisions above the boiling and below the freezing points. The zero is placed at the thirty-second division below the: freezing point ; so that, on this scale, the freezing point...
Page 119 - For a given pressure ebullition commences at a certain temperature, which varies in different liquids, but which, for equal pressures, is always the same in the same liquid. III. Whatever be the intensity of the source of heat, as soon as ebullition commences, the temperature of the liquid remains stationary.
Page 155 - ... which I will presently subjoin, as soon as I have added a few cautions for the sake of avoiding ambiguity Nor again, must the communication of heat, or its transitive nature, by means of which a body becomes hot when a hot body is applied to it, be confounded with the form of heat. For heat is one thing, and heating is another. Heat is produced by the motion of attrition without any preceding heat...
Page 59 - When light passes from any given medium into another, no matter what may be the angle of incidence, it always conforms to the following laws : 1. The planes of incidence and refraction coincide, both being normal to the surface separating the media, at the point of incidence. 2. The sine of the angle of incidence is equal to the sine of the angle of refraction multiplied by a constant quantity.
Page 179 - GENERAL INSTRUCTIONS. If the rules are not attended to, the paper will be cancelled. You may take the Elementary, or the Advanced, or the Honours paper, but you must confine yourself to one of them.
Page 176 - Eight questions are to be attempted: two in acoustics; three in light; three in heat. In all cases the number of the question must be placed before the answer on the worked paper. Three hours are allowed for this paper. 1 . The velocity of sound in water is much greater than its velocity in air ; why is this the case ? 2. You are required to express numerically the elasticity of the air on the top of a mountain as high as Mont Blanc, on the top of a mountain as high as Ben Nevis, and at the sea level...
Page 129 - WINDS. 620. Wind is air put in motion. The air is never entirely free from motion, but the velocity with which it moves is perpetually varying.