Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 860
... Parallel mirrors , 959 . Mirrors at right angles , 960. Mirrors at 60 , 961. Kaleidoscope , 962. Pepper's ghost , 963. Deviation produced by rotation of mirror , 964. Sextant , 965. Spheri- cal mirrors , 966. Conjugate foci , 967 ...
... Parallel mirrors , 959 . Mirrors at right angles , 960. Mirrors at 60 , 961. Kaleidoscope , 962. Pepper's ghost , 963. Deviation produced by rotation of mirror , 964. Sextant , 965. Spheri- cal mirrors , 966. Conjugate foci , 967 ...
Página 888
... parallel walls , at a sufficient distance apart , is favourable for the observance of this latter phenomenon . One of the most frequently cited instances of multiple echoes is that of the old palace of Simonetta , near Milan , which ...
... parallel walls , at a sufficient distance apart , is favourable for the observance of this latter phenomenon . One of the most frequently cited instances of multiple echoes is that of the old palace of Simonetta , near Milan , which ...
Página 889
... parallel to the axis ; but this explana- tion fails to account for the utility of the bell , which experience has shown to be considerable . It appears from a theoretical investigation by Lord Rayleigh that the speaking - trumpet causes ...
... parallel to the axis ; but this explana- tion fails to account for the utility of the bell , which experience has shown to be considerable . It appears from a theoretical investigation by Lord Rayleigh that the speaking - trumpet causes ...
Página 956
... as to render the rays parallel on emergence , and in this condition they traverse the interval VELOCITY OF LIGHT . 957 between the two stations . Fig . 649. - Fizeau's Experiment . Fig . 650. - Wheel at Rest . 956 PROPAGATION OF LIGHT .
... as to render the rays parallel on emergence , and in this condition they traverse the interval VELOCITY OF LIGHT . 957 between the two stations . Fig . 649. - Fizeau's Experiment . Fig . 650. - Wheel at Rest . 956 PROPAGATION OF LIGHT .
Página 960
... parallel beam of light fell upon the revolv- ing mirror , and was reflected to and from the distant station . On its return it was reflected by the revolving mirror into an observing telescope furnished with two parallel wires near ...
... parallel beam of light fell upon the revolv- ing mirror , and was reflected to and from the distant station . On its return it was reflected by the revolving mirror into an observing telescope furnished with two parallel wires near ...
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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