Philosophical Transactions of the Royal Society of London, Volumes 91-92W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1802 |
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Abbé HAUY adularia affinity alkali alumina ammonia appears barytes bodies calomel Ceres chaleur colour considerable crystals dégré degree deux diameter direction distance double star earth equal été expériences experiments Fair felspar fracture glass grains Hazy heat hyperbola hyperoxygenized muriatic acid imperfect corundum inches Interception laminæ less light liquor magnesia matrix MDCCCII mercury metallic motion muriate of potash nature nearly nebula nickel nitric acid observed obtained oriental ruby oxide of iron oxygenized muriatic acid papillæ paradoxus particles perfect perfectly planes Plate portion precipitate primitive rhomboid prism produced proportion pyramid pyrites quadrupeds quantity Rain rayons refractive power respect rhomboid salt sapphire shew silica soleil libre solid angle solution Sous le verre specific gravity specimens stars stone strontia substance sulphuric supposed surface SW 1 Cloudy terminal faces Theorem Therm thermométre tion tourmalin transparent undulations Ursæ vibrations
Popular passages
Page 21 - ... will affect equally the particles in unison with yellow and blue, and produce the same effect as a light composed of those two species ; and each sensitive filament of the nerve may consist of three portions, one for each principal colour.
Page 17 - And in like manner, when a ray of light falls upon the surface of any pellucid body, and is there refracted or reflected, may not waves of vibrations, or tremors, be thereby excited in the refracting or reflecting medium at the point of incidence...
Page 28 - ... the obstacle. . . . The waves on the surface of stagnating water, passing by the sides of a broad obstacle which stops part of them, bend afterwards and dilate themselves gradually into the quiet water behind the obstacle. The waves, pulses or vibrations of the air, wherein sounds consist, bend manifestly, though not so much as the waves of water.
Page 28 - The waves, pulses or vibrations of the air, wherein sounds consist, bend manifestly, though not so much as the waves of water. For a bell or a cannon may be heard beyond a hill which intercepts the sight of the sounding body, and sounds are propagated as readily through crooked pipes as through straight ones. But light is never known to follow crooked passages nor to bend into the shadow.
Page iii - Society answerable, for the certainty of the facts, or propriety of the reasonings, contained in the several Papers so published, - which must still rest on the credit or judgment of their respective Authors.
Page 498 - ... one, has also, as it may be called, a power of penetrating into time past. To explain this, we must consider that, from the known velocity of light, it may be proved, that when we look at Sirius, the rays which enter the eye cannot have been less than 6 years and 4^- months coming from that star to the observer.
Page 28 - Are not all hypotheses erroneous in which Light is supposed to consist in pression or motion propagated through a fluid medium P ' ' If it consisted in pression or in motion propagated either in an instant or in time, it would bend into the shadow.
Page 29 - For the fixed stars, by the interposition of any of the planets, cease to be seen. And so do the parts of the sun by the interposition of the moon. Mercury, or Venus. The rays which pass very near to the edges of any body are bent a little by the action of the body...
Page 15 - Is not the heat of the warm room conveyed through the vacuum by the vibrations of a much subtiler medium than air, which, after the air was drawn out remained in the vacuum?
Page 521 - ... in diameter. The star is perfectly in the centre, and the atmosphere is so diluted, faint, and equal throughout, that there can be no surmise of its consisting of stars ; nor can there be a doubt of the evident connection between the atmosphere and the star. Another star not much less in brightness, and in the same field with the above, was perfectly free from any such appearance.