Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 861
... Bright spot and its relation to magnifying power , 1031. Terrestrial eye - piece , 1032 , Galilean telescope . Its peculiarities . Opera - glass , 1033. Reflecting telescopes , 1034. Silvered specula , 1035. Measure of brightness ...
... Bright spot and its relation to magnifying power , 1031. Terrestrial eye - piece , 1032 , Galilean telescope . Its peculiarities . Opera - glass , 1033. Reflecting telescopes , 1034. Silvered specula , 1035. Measure of brightness ...
Página 927
... bright image of the sun , which will appear as a small spot of light . As long as the apparatus remains at rest , we shall not observe any movement of the image ; but if the tuning - fork vibrates , the image will move rapidly up and ...
... bright image of the sun , which will appear as a small spot of light . As long as the apparatus remains at rest , we shall not observe any movement of the image ; but if the tuning - fork vibrates , the image will move rapidly up and ...
Página 931
... bright point m , produced by making a little scratch on the end of the prong with a diamond , is observed through the microscope , and is illuminated , if necessary , by converging a beam of light upon it through the lens c . When the ...
... bright point m , produced by making a little scratch on the end of the prong with a diamond , is observed through the microscope , and is illuminated , if necessary , by converging a beam of light upon it through the lens c . When the ...
Página 933
... 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 called a kaleidophone . In its best form ( devised by Professor Barrett ) ...
... 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 called a kaleidophone . In its best form ( devised by Professor Barrett ) ...
Página 964
... bright . The distances are then mea- sured , and their squares are assumed to be directly proportional to the illuminating powers of the lamps . 948. Rumford's Photometer . - Rumford's photometer is based on the comparison of shadows ...
... bright . The distances are then mea- sured , and their squares are assumed to be directly proportional to the illuminating powers of the lamps . 948. Rumford's Photometer . - Rumford's photometer is based on the comparison of shadows ...
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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