Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 871
... placed a clock - work arrangement for producing a number of strokes on a bell . It is placed on a thick cushion of felt , or other inelastic material , and the air in the receiver is exhausted as com- pletely as possible . If the clock ...
... placed a clock - work arrangement for producing a number of strokes on a bell . It is placed on a thick cushion of felt , or other inelastic material , and the air in the receiver is exhausted as com- pletely as possible . If the clock ...
Página 880
... placed two observers -one near a cannon , and the other at about three miles distance ; each of whom on hear- ing the report , gave a signal through an electric telegraph . The result obtained was in precise agreement with that stated ...
... placed two observers -one near a cannon , and the other at about three miles distance ; each of whom on hear- ing the report , gave a signal through an electric telegraph . The result obtained was in precise agreement with that stated ...
Página 890
... placed with respect to the lower one . The inside of the box is lined with felt , to prevent the vibrations from being communicated to the box , and to weaken internal reflection . When the whistle is sounded , if a membrane , with sand ...
... placed with respect to the lower one . The inside of the box is lined with felt , to prevent the vibrations from being communicated to the box , and to weaken internal reflection . When the whistle is sounded , if a membrane , with sand ...
Página 896
... placed at the point . The word loud is also frequently applied to a source of sound , as when we say a loud voice , the reference being to the loudness as heard at a given distance from the source . The diminution of loud- ness with ...
... placed at the point . The word loud is also frequently applied to a source of sound , as when we say a loud voice , the reference being to the loudness as heard at a given distance from the source . The diminution of loud- ness with ...
Página 905
... placed so that the style barely touches the blackened surface . The fork is then made to vibrate by bowing it , and the cylinder is turned . The result is a wavy line traced on the blackened surface , and the number of wave - forms ...
... placed so that the style barely touches the blackened surface . The fork is then made to vibrate by bowing it , and the cylinder is turned . The result is a wavy line traced on the blackened surface , and the number of wave - forms ...
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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