The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . s that have the same tint are called iso-chromatic lines. See interference Jigures, under interfer-ence, b. Beside these [dark bands), there are also variable bands,which correspond to the brushes which cross the isochro-matic curves. SpoUisicoode, Polarisation, p. 78. _ 2. In jihoiog., same as (i-sokro-nal), a. [As isochron-ous+ Uniform in tiine; of equal time; per- . , . ., . .. -^—. , ^ .,, formed in equal times. Two pendulums w


The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . s that have the same tint are called iso-chromatic lines. See interference Jigures, under interfer-ence, b. Beside these [dark bands), there are also variable bands,which correspond to the brushes which cross the isochro-matic curves. SpoUisicoode, Polarisation, p. 78. _ 2. In jihoiog., same as (i-sokro-nal), a. [As isochron-ous+ Uniform in tiine; of equal time; per- . , . ., . .. -^—. , ^ .,, formed in equal times. Two pendulums which weight: see barometer.] laphys. neoa., a, Vme Isocarnae (i-so-kiirnel ii vl TNL onf;„„ „!„„„„ —ii,„ , t -i/,._ ..,-i_- ,^, ^ •, . •?..-. i •,. .L . .; > 1--i, tions of a pendulum in the curve of a cycloid have the same property, being all performed in the same time,whether the arc be large or small. Also isochronous.—Isochronal line, a line in which a heavy body descendswithout acceleration or Heart-cockle {[socardia cor). Dore has published an elaborate set of maps construct-ed on this principle, in which he shows by a system ofThermic Isabnormals the deviations from the mean of eachmonth, and of the year, on the dilterent parts of the _ globe, Buchan, Handy-book of Meteorology, p. 126. isobar (iso-bar), «. [< Gr. laog, equal, + jiapn^weight: see barometer.] laphys. geo</., places on the surface of the globeat which the barometric pressure is the places not situated at the sea-level, a correction mustbe applied to each barometric observation corresponding kiir-dii-de), it. pi.[NL., < Isocardia +-ida.] A family ofsiphonate bivalvemoUusks, namedfrom the genus Iso-cardia ; the heart-cockles. They have the shellcordifomi and ventricose, and the beaks sonietimea sub-spiral, 2 cardinal and 1 or 2 lateral teeth in each valve, impressions narrow, and the pallial line simple,Isocardia cor,


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