Transactions of the Cambridge Philosophical SocietyUniversity Press, 1827 |
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achromatic angle antimony appears axis barom basaltic beds birds bismuth Bottisham brass chromatic aberration coal Cockfield Fell colour copper crystals d'Ornith described deviation diameter direction distance Ditto effect Eglestone equal equation escarpment eye-glass eye-piece feet felspar focal length forces formation galvanoscope GENUS Geological glass granular grinding Hazle heat Hence High Teesdale Holwick horizontal Houghton-le-side inches indurated intervals iron leaden tool lens limestone Lunedale magnetic masses of trap metals Mohs motion nearly negative object-glass observed paper parallel phenomena plane Plate platina position principal prism produced pyramid quantity rays refraction rhombohedron river rocks sandstone shale shew Shooter's Hill side silver slate-clay species specimens spherical spherical aberration strata supposed surface Tees telescope Temm temperature terminal edges therm tion Topaz transverse trap dykes velocity of sound Whin Sill Whin-Sill wires zinc
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Seite 135 - The inquiries with regard to the transmission of sound in the atmosphere,* which, notwithstanding the curious investigations of Newton, Laplace, Poisson, and others, require the further aid of experiment for satisfactory determination, are, I think, the following, viz.: " 1st, Whether hygrometric changes in the atmosphere have much or little influence on the velocity of sonnd?
Seite 135 - Whether sound, independently of the changes in the air's elasticity, move quicker or slower near the earth's surface than at some distance from it? (See Savart's interesting papers on the Communication of Sonorous Vibration) 6.
Seite 136 - Whether or not the principle of the parallelogram of forces may be employed in estimating the effect of wind upon sound, when their respective velocities do not aid or oppose each other in the same line or nearly so?
Seite 135 - Huscheribroek conjectured, sound have not different degrees of velocity, at the same temperature, in different regions of the earth? And whether high barometric...
Seite 135 - That in the case of echoes the velocity of the reflected sound is the same as that of the direct sound.
Seite 26 - It will be seen by an inspection of the map that the sedimentary rocks surround the central mass of andesite, adjacent to the town of San Jose, almost entirely.
Seite 47 - Take a bar of antimony about eight inches long, and half an inch square, connect its extremities by twisting a piece of brass wire round them so as. to form a loop, each end of the bar having several coils of the wire. If one of the extremities be heated for a short time, with a spirit lamp, electro-magnetic phenomena may be exhibited in every part of it.
Seite 136 - ... the formulae which should express the relation of the intervals include more than thermometric and barometric coefficients ? 7th, Whether or not, the principle of the parallelogram of forces may be employed in estimating the effect of wind upon sound, when their respective velocities do not aid, or oppose...
Seite 136 - I hope to devote myself at no very remote period: but others of them, it is evident, can only be satisfactorily answered, if ever, by means of a cautious classification of skilful experiments made by various philosophers in different parts of the globe.
Seite 266 - My object now was to form a lens which should refract more powerfully the rays in one certain plane, than those in the plane at right angles to it; and the first idea was to employ one whose surfaces should be cylindrical and concave, the axes of the cylinders crossing each other at right angles, and their radii being different.