Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 861
... less . Same principle applies to mirrors . Reason why high magnification often produces loss of effective brightness , 1037. Intrinsic brightness of image in theoretically perfect telescope is equal to brightness of object . Effective ...
... less . Same principle applies to mirrors . Reason why high magnification often produces loss of effective brightness , 1037. Intrinsic brightness of image in theoretically perfect telescope is equal to brightness of object . Effective ...
Página 868
... less of gyratory movement , as long as the plate is vibrating . This phe- nomenon , after long baffling explanation , was shown by Faraday to be due to indraughts Fig . 595 . of air , and ascending currents , Vibration of String ...
... less of gyratory movement , as long as the plate is vibrating . This phe- nomenon , after long baffling explanation , was shown by Faraday to be due to indraughts Fig . 595 . of air , and ascending currents , Vibration of String ...
Página 871
... less of unmusical noise . The sounds of bells and drums have a sort of intermediate character ; and the confused as- semblage of sounds which is heard in the streets of a city blends at a distance into an agreeable hum . 868. Vehicle of ...
... less of unmusical noise . The sounds of bells and drums have a sort of intermediate character ; and the confused as- semblage of sounds which is heard in the streets of a city blends at a distance into an agreeable hum . 868. Vehicle of ...
Página 877
... less marked , and ultimately to disappear , as the distance is 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 ...
... less marked , and ultimately to disappear , as the distance is 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 ...
Página 881
... less than D nor greater than 1:41 . Its actual velocity , as determined by observation , is identical , or practically identical , with the latter of these limiting values . Hence we must infer that the compressions and extensions which ...
... less than D nor greater than 1:41 . Its actual velocity , as determined by observation , is identical , or practically identical , with the latter of these limiting values . Hence we must infer that the compressions and extensions which ...
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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