Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 866
... regarded as altogether independent of the amplitude . When the spring is long , the extent of its movements may gene- rally be perceived by the eye . In consequence of the persistence of impressions , we see the spring in all its ...
... regarded as altogether independent of the amplitude . When the spring is long , the extent of its movements may gene- rally be perceived by the eye . In consequence of the persistence of impressions , we see the spring in all its ...
Página 880
... regarded as representing the time required for the propa- gation of the sound across the intervening distance , for the time occupied by the propagation of light across so small a distance is inappreciable . It is by experiments of this ...
... regarded as representing the time required for the propa- gation of the sound across the intervening distance , for the time occupied by the propagation of light across so small a distance is inappreciable . It is by experiments of this ...
Página 891
... regarded as a plane mirror ) of the waves which would exist in the prolongation of the tube if the obstacle were withdrawn . At the distance of half a wave - length from the obstacle the motions due to the direct and reflected waves ...
... regarded as a plane mirror ) of the waves which would exist in the prolongation of the tube if the obstacle were withdrawn . At the distance of half a wave - length from the obstacle the motions due to the direct and reflected waves ...
Página 896
... Regarded objectively , it depends , in the case of sounds of the same pitch and character , upon the energy of the aerial vibrations in the neighbourhood of the ear , and is proportional to the square of the amplitude . Our auditory ...
... Regarded objectively , it depends , in the case of sounds of the same pitch and character , upon the energy of the aerial vibrations in the neighbourhood of the ear , and is proportional to the square of the amplitude . Our auditory ...
Página 901
... regarded as deep or high . 894. Minor Scale and Pythagorean Scale . - The difference between a major and minor tone is expressed by the ratio § , and is called a comma . The difference between a minor tone and a limma is ex- pressed by ...
... regarded as deep or high . 894. Minor Scale and Pythagorean Scale . - The difference between a major and minor tone is expressed by the ratio § , and is called a comma . The difference between a minor tone and a limma is ex- pressed by ...
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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