Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 861
... increases with power of eye - piece till magnifying power is 1039. Illumination of image on screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view in astronomical telescope ...
... increases with power of eye - piece till magnifying power is 1039. Illumination of image on screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view in astronomical telescope ...
Página 877
... increased . Fig . 606 represents a diametral section of a series of spherical waves . Their mode of propagation has some analogy to that of the circular A B C D E F G H H H A B C D E F G H a 1 J K L 1 J K L a K L a K L a a ...
... increased . Fig . 606 represents a diametral section of a series of spherical waves . Their mode of propagation has some analogy to that of the circular A B C D E F G H H H A B C D E F G H a 1 J K L 1 J K L a K L a K L a a ...
Página 879
... increases . This involves a continual decrease of loudness . An undulation involves the onward transference of energy ; and the amount of energy which traverses , in unit time , any closed surface described about the source , must be ...
... increases . This involves a continual decrease of loudness . An undulation involves the onward transference of energy ; and the amount of energy which traverses , in unit time , any closed surface described about the source , must be ...
Página 880
... increases with the temperature , being proportional to the square root of the absolute temperature by air thermometer ( § 325 ) . If t denote the ordinary Centigrade tempera- 1 A recent determination by Mr. Stone at the Cape of Good ...
... increases with the temperature , being proportional to the square root of the absolute temperature by air thermometer ( § 325 ) . If t denote the ordinary Centigrade tempera- 1 A recent determination by Mr. Stone at the Cape of Good ...
Página 882
... increase of velocity cannot be greater than about 1 part in 440 , which will be between 2 and 3 feet per second . The increase should , in fact , be somewhat VELOCITY IN GASES AND LIQUIDS . 883 less than this 882 PRODUCTION AND ...
... increase of velocity cannot be greater than about 1 part in 440 , which will be between 2 and 3 feet per second . The increase should , in fact , be somewhat VELOCITY IN GASES AND LIQUIDS . 883 less than this 882 PRODUCTION AND ...
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Términos y frases comunes
achromatic analyser angle of incidence beam body bright lines called centimetres centre coincidence colours concave mirror conjugate foci convex convex lens crystal curvature denote diameter direction distance employed equal experiment eye-piece flame focal length frequency of vibration fundamental note glass harmonics Hence Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying power medium metres minimum deviation nearly node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagation radius rarefaction ratio reflected rays refrangibility represented retina rotation screen seen side slit solar spectra spectrum spherical string subtends surface telescope tion tone traversing tube undulation velocity of sound vertical vibrations vibrations per second violet virtual image visual angle wave-front wave-length waves