Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 860
... Principal focus , 968. March of conjugate foci , 969. Construction for image , 970. Size of image , 971. Phantom bouquet , 972 . Image on screen , 973. Caustics , primary and secondary foci , 974. Two focal lines , 975. Virtual images ...
... Principal focus , 968. March of conjugate foci , 969. Construction for image , 970. Size of image , 971. Phantom bouquet , 972 . Image on screen , 973. Caustics , primary and secondary foci , 974. Two focal lines , 975. Virtual images ...
Página 861
... Principal focus , 1001. Optical centre , 1002. Conjugate foci . Image erect or inverted , enlarged or diminished , 1003. Formulæ , 1004. Conjugate foci on secondary axis , 1005. March of conjugate foci , 1006. Construction for image ...
... Principal focus , 1001. Optical centre , 1002. Conjugate foci . Image erect or inverted , enlarged or diminished , 1003. Formulæ , 1004. Conjugate foci on secondary axis , 1005. March of conjugate foci , 1006. Construction for image ...
Página 933
... principal direc- tions of vibration in Blackburn's pendulum . A small bright metal knob is usually fixed on the vibrating extremity to render its path visible . The instrument constructed for this mode of exhibiting the figures is ...
... principal direc- tions of vibration in Blackburn's pendulum . A small bright metal knob is usually fixed on the vibrating extremity to render its path visible . The instrument constructed for this mode of exhibiting the figures is ...
Página 935
... principal gives the second tone , that is the octave above the fundamental . The stops called twelfth and fifteenth give the third and fourth tones , which are a twelfth ( octave + fifth ) , and a fifteenth ( double octave ) above the ...
... principal gives the second tone , that is the octave above the fundamental . The stops called twelfth and fifteenth give the third and fourth tones , which are a twelfth ( octave + fifth ) , and a fifteenth ( double octave ) above the ...
Página 938
... principal vowel sounds by a single reed fitted to various lengths of tube . Wheatstone , a few years later , made some advances in theory , 2 and constructed a machine by which nearly all articulate sounds could be imitated . Excellent ...
... principal vowel sounds by a single reed fitted to various lengths of tube . Wheatstone , a few years later , made some advances in theory , 2 and constructed a machine by which nearly all articulate sounds could be imitated . Excellent ...
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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