Mathematical Tracts on the Lunar and Planetary Theories: The Figure of the Earth, Precession and Nutation, the Calculus of Variations, and the Undulatory Theory of Optics |
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Page 254
... displacement and of motion consistent with undul tory vibration . The length of a wave we have explained to be the dis tance between two particles similarly displaced and moving similarly . The interval , in time , of two waves ( that ...
... displacement and of motion consistent with undul tory vibration . The length of a wave we have explained to be the dis tance between two particles similarly displaced and moving similarly . The interval , in time , of two waves ( that ...
Page 255
... displacement and motion of one are equal and opposite to those of the other . For instance , a and g , or e ' and ' , in ( 3 ) , ( y ) , ( d ) , ( e ) , or ( C ) , of fig . 1 or 2 are in opposite phases . It is easy to perceive that ...
... displacement and motion of one are equal and opposite to those of the other . For instance , a and g , or e ' and ' , in ( 3 ) , ( y ) , ( d ) , ( e ) , or ( C ) , of fig . 1 or 2 are in opposite phases . It is easy to perceive that ...
Page 257
... displacement in EF is the cause of future displacement in GH , because in consequence of the existence of this wave there will hereafter be a wave at GH : but we know that the displacement in EF causes no future dis- placement between ...
... displacement in EF is the cause of future displacement in GH , because in consequence of the existence of this wave there will hereafter be a wave at GH : but we know that the displacement in EF causes no future dis- placement between ...
Page 281
... displacement , and if we consider the point a + b λ we find where OM = a sin α 2 for the intensity of the blue light , 4c2 ( a + b ) 2 ' for the intensity of the next kind of light , COLOURED FRINGES OF INTERFERENCE . 281.
... displacement , and if we consider the point a + b λ we find where OM = a sin α 2 for the intensity of the blue light , 4c2 ( a + b ) 2 ' for the intensity of the next kind of light , COLOURED FRINGES OF INTERFERENCE . 281.
Page 289
... displacement of a particle is represented by the sum of these quantities . It must be recollected that by the reasoning in ( 37 ) we are entitled to suppose that the signs of A and B are different . 65. We have here however omitted the ...
... displacement of a particle is represented by the sum of these quantities . It must be recollected that by the reasoning in ( 37 ) we are entitled to suppose that the signs of A and B are different . 65. We have here however omitted the ...
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Common terms and phrases
analyzing plate angle angular velocity attraction axis bright co-ordinates coefficient common light Consequently cos² crystal curve different colours differential direction displacement distance disturbing force dR dR dt dt dt Earth ellipticity equal equation expression extraordinary ray front ƒ² glass Hence integration intensity investigation length longitude lunar lunar precession motion multiplied nearly Newton's rings node nutation ordinary ray parallel particles perigee perihelion perpendicular plane of incidence plane of polarization plane of reflection precession principal plane produced PROP proportion quantity radius vector refraction rhombohedron rings shew sin² spheroid suppose surface theory tion undulation vibration vt-x wave
Popular passages
Page 257 - We have, every reason,' he observes, ' to think that a part of the velocity of sound depends upon the circumstance that the law of elasticity of the air is altered by the instantaneous development of latent heat on compression, or the contrary effect on expansion. Now, if this heat required time for its development, the quantity of heat developed would depend...
Page 257 - Now, if this heat required time for its development, the quantity of heat developed would depend upon the time during which the particles remained in nearly the same relative state, that is, on the time of vibration. Consequently, the law of elasticity would be different for different times of vibration, or for different lengths of waves ; and therefore the velocity of transmission would be different for waves of different lengths. If we suppose some cause which is put in action by the vibration...
Page 306 - ... we easily arrive at this simple hypothesis explaining the whole : Common light consists of undulations in which the vibrations of each particle are in the plane perpendicular to the direction of the wave's motion. The polarization of light is the resolution of the vibrations of each particle into two, one parallel to a given plane passing through the direction of the wave's motion, and the other perpendicular to that plane ; which...
Page 198 - In planetary theory the adopted ratio of the mass of the Earth to the mass of the Moon is...
Page 229 - ... intensity of either. These intervals of silence and greatest intensity, called beats, will recur every second, but if the notes differ much from one another, the alternations will resemble a rattle ; and if the strings be in perfect unison, there will be no beats, since there will be no interference. Thus by interference is meant the coexistence of two undulations, in which the lengths of the waves are the same ; and as the magnitude of an undulation may be diminished by the addition of another...