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: Designed for the Use of Students in the University |
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Page 136
... lines perpendicular to the plane AEB . Then the angles GEg , HEh , KCk , LCI , are equal . And therefore since the axes of the pyramids GEr , HEs , KCt , LCv , are equally inclined to EC , the edge of the wedge 136 FIGURE OF THE EARTH .
... lines perpendicular to the plane AEB . Then the angles GEg , HEh , KCk , LCI , are equal . And therefore since the axes of the pyramids GEr , HEs , KCt , LCv , are equally inclined to EC , the edge of the wedge 136 FIGURE OF THE EARTH .
Page 137
... axes will be as their lengths . And the attraction of each in the direction EF or CD will be as its length multiplied by the cosine of the angle which its axis makes with EF or CD ; or since this angle is the same for all , the ...
... axes will be as their lengths . And the attraction of each in the direction EF or CD will be as its length multiplied by the cosine of the angle which its axis makes with EF or CD ; or since this angle is the same for all , the ...
Page 146
... axes of the spheroid which is in equilibrium . The force at the pole , by Prop . 6 , = 4π.kb √ ( 1 − e3 ) - - es sin - 1e ) . The attraction at the equator , by Prop . 7 , e2 ) = 2w.kb ( sin - le - √ ( 1-6 ) ) ; the centrifugal force ...
... axes of the spheroid which is in equilibrium . The force at the pole , by Prop . 6 , = 4π.kb √ ( 1 − e3 ) - - es sin - 1e ) . The attraction at the equator , by Prop . 7 , e2 ) = 2w.kb ( sin - le - √ ( 1-6 ) ) ; the centrifugal force ...
Page 148
... axes either in the proportion of 230 231 , or in the proportion of 1 : 681. It is found by That is , the Earth measurement , that the ratio of the axes is nearly 148 FIGURE OF THE EARTH ,
... axes either in the proportion of 230 231 , or in the proportion of 1 : 681. It is found by That is , the Earth measurement , that the ratio of the axes is nearly 148 FIGURE OF THE EARTH ,
Page 149
... axes is nearly 300 : 301 : hence , the Earth is not homogeneous . 35. In the spheroid of small ellipticity , the proportion of gravity at the pole to that at the equator , is the same as the ratio of the axes , or is the ratio 231 : 230 ...
... axes is nearly 300 : 301 : hence , the Earth is not homogeneous . 35. In the spheroid of small ellipticity , the proportion of gravity at the pole to that at the equator , is the same as the ratio of the axes , or is the ratio 231 : 230 ...
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Mathematical Tracts on the Lunar and Planetary Theories, the Figure of the ... George Biddell Airy No preview available - 2018 |
Mathematical Tracts on the Lunar and Planetary Theories, the Figure of the ... George Biddell Airy No preview available - 2015 |
Mathematical Tracts on the Lunar and Planetary Theories, the Figure of the ... George Biddell Airy No preview available - 2018 |
Common terms and phrases
analyzing plate angle angle of incidence angular velocity attraction axes axis bright co-ordinates coefficient common light Consequently cos² crystal curve density different colours differential direction displacement distance disturbing force dR dR dt dt dx dx Earth ellipticity equal equation expression extraordinary ray Fresnel's rhomb front function ƒ² glass Hence integration intensity investigation length longitude lunar Moon Moon's motion multiplied nearly Newton's rings nutation orbit ordinary ray parallel particles perigee perihelion perpendicular plane of incidence plane of polarization plane of reflection precession principal plane produced PROP proportion quantity refraction rhombohedron rings shews sin² spheroid suppose surface true anomaly undulation vibration vt-x wave
Popular passages
Page 12 - The centre of gravity of the Earth and Moon describes about the Sun, very nearly, an ellipse in one plane, and the area passed over by its radius vector is very nearly proportional to the time.
Page 285 - We have every reason to think that a part of the velocity of sound depends on the circumstance that the law of elasticity of the air is altered by the instantaneous developement of latent heat on compression, or the contrary effect on expansion. Now if this heat required time for its developement, the quantity of heat developed would depend on the time during which the particles remained in nearly the same relative state; that is, on the time of vibration. Consequently...
Page 286 - 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 339 - On considering this presumption in conjunction with the second and third conclusions, 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...
Page 343 - ... that there are three directions^" at right angles to each other, in which if a particle be disturbed, the resultant of the forces * M.
Page 343 - To explain the separation of common light into two pencils by doubly refracting crystals : and to account for the polarization of the two rays in planes at. right angles to each other.
Page 255 - I* when a single undulation' only is considered. It is to be observed that a is the maximum vibration of any particle. PROP. 5. To explain the interference of undulations. 9. By interference is meant the co-existence of two undulations in which the length of a wave is the same. The conception of interference is not in any circumstances...
Page 284 - ... and this will cause a reflected wave. Thus when light passes through glass there will be reflection at both surfaces. But there is this difference between th'e two reflections : one is caused by a vibration in the same direction as that of the incident ray, and the other by a vibration in the direction opposite to that of the incident ray. We shall find this distinction important in explaining a fundamental experiment (65). The same thing may be thus shewn. If we suppose a mass of glass to be...