Scientific Memoirs, Being Experimental Contributions to a Knowledge of Radiant EnergyHarper, 1878 - 473 páginas |
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absorbed absorption actinometer allotropic atoms beam blue bodies bulb carbonic acid chemical action chemical changes chemical rays chlorine and hydrogen chlorophane color combustion compound condition convex lens copper daguerreotype dark daylight decompose decomposition diffraction spectrum effect electric spark emitted endosmosis evolved experiments exposed exposure facts Fahr fixed lines flame Fraunhofer lines gases glass green heat heliostat hydrochloric acid ical impression incandescent inch in diameter increase intensity iodide of silver iodine lamp lens less refrangible liquid maximum Memoir ment mercury metallic mixture motion needle observed obtained optical oxidation oxygen pass phenomena Philosophical Magazine phosphorescence phosphorus photographic photometer plate platinum principle prism prismatic produced radiations refrangible rays refrangible regions remarkable retina rise screen sensitive shine silver iodide slit solar solution space substance surface takes place temperature tint tion trough tube vapor vibrations violet visible spectrum voltaic wave-lengths wires yellow
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Página 34 - As the luminous effects are undoubtedly owing to a vibratory movement executed by the molecules of the platinum, it seems from the foregoing considerations to follow, that the frequency of those vibrations increases with the temperature.
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Página 365 - That if two liquids communicate with one another in a capillary tube or in a porous or parenchymatous structure and have for that tube or structure different chemical affinities movement will ensue ; that liquid which has the most energetic affinity will move with the greatest velocity and may even drive the other fluid entirely before it.
Página 399 - ... so nearly equal that we may impute the differences to errors of experimentation. Assuming this as true, it necessarily follows that in the spectrum any two series of undulations will have the same heating power, no matter what their wave-lengths may be. But this conclusion leads unavoidably to a most important modification of the views now universally held as regards the constitution of the spectrum. When a ray falls on an extinguishing surface, heat is produced ; but that heat did not pre-exist...
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Página 80 - ... spaces successively towards the violet; and that of the latter from the bluish brush to the bright Leyden sparks, by a like screen drawn from the violet towards the red. The true electric light exhibits properties resembling those observed in actual combustions, as though there was an oxidation of a portion of the translated matter when the spark is taken in air. The order of evolution of rays in this instance happens to be the same as in the second illustration of Professor Dove, that is, from...
Página 35 - Petit holds to a wider extent, there are in our inquiry certain circumstances to be taken into account not contemplated by those philosophers. Dulong and Petit throughout their memoir regard radiant heat as a homogeneous agent, and look upon the theory of exchanges, which is indeed their startingpoint and guide, as a very simple affair.