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=িদ্যুৎ-তত্ত্ব শিক্ষক 8为文 Large calorie = kilogram-calorie = Iooo small calories – one kilogram of water raised one degree Centigrade at the temperature of maximum density. CANDLE INTERNATIONAL. The international unit of candlepower maintained jointly by national laboratories of England, France and United States of America. w CARAT. The diamond carat standard in U. S.–200 milligrams. Old standard 205.3 milligrams = 3' 168 grs. The gold carat : pure gold is 24 carats ; carat is 1/24 part. CIRCULAR AREA, The square of the diameter = I’2734 × true area. True area - 9785321 x circular area. COULOMB. Unit of quantity. The international coulomb is the quantity of electricity transferred by a current of one international amperc in one sccond – to E. M. U = 3 x 10" . . S. U. Coulombs = (volts-seconds )/ombs – ampers x seconds. CUBIT ~ 18 inches. * DAY. Mean solar day = 1440 minutes = 86400'seconds = 1°0097.379 sidereal day, Sidereal day = 86164'20 mean solar seconds. D, G, T. 3/4 inch. ; 1 12 the apparent diameter of the sun or moon. DIOPTER. Unit of “power” of a lens. The number of diopters = the reciprocal of the focal length in meter S. DYNE. C. G. S. unit of force = that force which acting fos one second on oue gram produces a velocity of one cm. per sec. = g + gravity acceleration in cm/sec sec. to Dynes = wt. in gram. x acceleration of gravity in cm'sec/sec.