The Century dictionary and cyclopedia; a work of universal reference in all departments of knowledge, with a new atlas of the world .. . unlike parts of aeoinpoiind (twin) crystal of quartz become dissimilarlyelectritled by change of temperature. This can be wellstiown by shaking over a heated section of such a crystal amixture of red lead and sulphur; the former collects onthe parts which are negatively, the latter on those whichare positively electritled. The phenomenon is closely re-lated to the vaiiations in stress which occur In the crystalwhen its temperature is altered. liy smue writers
The Century dictionary and cyclopedia; a work of universal reference in all departments of knowledge, with a new atlas of the world .. . unlike parts of aeoinpoiind (twin) crystal of quartz become dissimilarlyelectritled by change of temperature. This can be wellstiown by shaking over a heated section of such a crystal amixture of red lead and sulphur; the former collects onthe parts which are negatively, the latter on those whichare positively electritled. The phenomenon is closely re-lated to the vaiiations in stress which occur In the crystalwhen its temperature is altered. liy smue writers ;;.i/ri>-ftectnatif is to include also the phiimmena of thermic-electricity, which, however, are totally dllterent in known as cardinal pyrogallate (pi-ro-galat), «. [< Gr. my), fire,ilor. + E. giilhitc] A salt of pyrogallic acid. pyrochroid (in-mkro-id), a. and «. I. «. Of or pyrogallic (pi-ro-galik), u. [< Gr. Tiy), fire, -t-pertaining to tlie Iyrochriiidic. E. ipillic-.] Obtained from gallic acid by the II, «. A beetle of the family Pyroohroidx. action of heat: noting an acid, or more properly. Vcniiilion I-lyca(chcr ( Pyrotephnlus rubiiuus), mjlle. crest and the whole under ]iarts flaming-red,the back, wings, and tail dusky-brown. isaliout six inches long. A variety of this is found inMexico and the southwestern piu-ts of the United are several others. pyrochlore (pirii-klor), n. [t)piii;,yellowish-green: see clilorin.] Aniobo-titanate of calcium, cerium, and other bases,occurring in isometric crystals, commonly oc-tahedrons, of a brownish color and resinousluster. It turns yellowish-green under theblinvpipe. whence the name. Pyrochroa (pi-rokro-il), «. [NL. (Geoflfroy,17G2). < Gr. -Ip, fire, + ,T/«i color.] A genusof heteromerous beetles, typical of the familyPyrinhriiidx, and comprising about a dozenspecies, of which 2 are found in North Amer-ica, 1 in Japan, and the rest in Europe. and /.
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