Journal . water by raising the reservoir I until jthe liquid has risen above the bulb G, the remaining space up to the cick being filled by water introduced |through F. The test tube is now corked and connectedwith the burette C. 8cc. of sulphuric acid (17 sp. gr.)are introduced drop by drop into A through B, the cockof the latter is closed, that marked E opened andthe liquid in the test tube gradually raised toboiling, the pressure having been diminished bypreviously lowering the water reservoir I. Afterten minutes boiling, during which the reservoirhas been still further lowered, if necessar
Journal . water by raising the reservoir I until jthe liquid has risen above the bulb G, the remaining space up to the cick being filled by water introduced |through F. The test tube is now corked and connectedwith the burette C. 8cc. of sulphuric acid (17 sp. gr.)are introduced drop by drop into A through B, the cockof the latter is closed, that marked E opened andthe liquid in the test tube gradually raised toboiling, the pressure having been diminished bypreviously lowering the water reservoir I. Afterten minutes boiling, during which the reservoirhas been still further lowered, if necessary, to main-tain the diminished pressure, the tube is cooled some- must be mule by multiplying or dividing by (1 r 000367 t)where t is the variation in temperature, according asthe solution is cooler or wanner than the normal, Atable of results obtained with many irons and steels,estimated both by this and other processes, shows astriking agreement in each case between the old and thenew methods.—W. G. wdiat and together with the connecting tube l> is carefullyfilled with water introduced through B. The cock Eis then closed and the total volume of air and carbondioxide read off after levelling with the reservoir. Iis then once more lowered and the cock II closed, inorder to draw in a quantity of a 10 per cent, hydratesolution through F. Afier the carbon dioxide has beencompletely absorbed, H is reopened, the liquid levelledagain and a reading of the amount of residual air istaken. The diltercnce between the two readings willbe the volume of carbon dioxide evolved from the carbonin the iron. Evidently if 02grni. of substance were used,each cc. of C02 will correspond to 0 253 per cent, of C,and the factor 0253 multiplied by the number of cc. ofgas should give a direct reading of the percentage ofcarbon. But this is not quite correct, since a certainquantity of (to be found only by experiment) isabsorbed by tbe water in the tube. By treating pureanhydrous sodium carbo
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
