Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 290
w light*But if a plate of platinumbe placed within, as inFig. 342, that interceptsthe molecules and so seem sto cast a shadow. It isnot really a shadow, how-ever, only a place whereFig. S42. the tube is not struck by the moving molecules. The manner of movement of thesemolecules does not differ… … RADIANT MATTEE. 281 a solid, either their motion is stopped altogether, or theyare deprived of the power to emit light. Other substances besides glass can be rendered fluorescent in a similar way.Thus if a mass ofrubies be placed infront of such a —pole, see Fig. 343,they begin to shinewith a…
Physics
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