The London, Edinburgh and Dublin philosophical magazine and journal of science . a stop-cock, and the other is connected with a piece of capillarytubing E, 100 and about *3 mil-lim. in internal diameter;this in its turn is joinedto the gauge E, and hasa stopcock H by meansof which the whole maybe placed in communica-tion with the gauge stands side byside, in a trough of mer-cury, with a barometer-tube Gr in front of amirror-scale divided intomillimetres, the pressureof the vapour in A being-given by the differencein height of the mercuryin Gr and F. In makingan exper
The London, Edinburgh and Dublin philosophical magazine and journal of science . a stop-cock, and the other is connected with a piece of capillarytubing E, 100 and about *3 mil-lim. in internal diameter;this in its turn is joinedto the gauge E, and hasa stopcock H by meansof which the whole maybe placed in communica-tion with the gauge stands side byside, in a trough of mer-cury, with a barometer-tube Gr in front of amirror-scale divided intomillimetres, the pressureof the vapour in A being-given by the differencein height of the mercuryin Gr and F. In makingan experiment, a quan-tity of salt along with apiece of granulated zinc or tin is introduced into A, and water sufficient to rather morethan cover the bulb of the thermometer is then added. Thequantity of salt is so great that some of it remains undis-solved at the highest temperature reached during the experi-ment. The tube is then placed in position and surrounded bya bath of water, the temperature of which is governed by athermostat. The temperature of the water is then raised to. * Phil. Mag. February 1883. 366 Mr. W. W. J. Nicol on the 5° above the point at which the vapour-pressure is to bedetermined. The temperatures at which determinations weremade were 65°, 75°, 85°, 95°, as indicated by the thermo-meter B. The temperatures of the bath were therefore respec-tively 70°, 80°, 90°, and 100°. The temperature of the bathhaving become constant, the stopcock H is closed and D isopened, communication with a water-pump being thus estab-lished. As soon as ebullition has commenced, D is closed andopened occasionally till the reading of B is one degree or solower than the temperature of experiment. After steady boil-ing for some time, H is momentarily opened; the temperature,as indicated by B, rises immediately a tenth or so: in this waythe temperature of ebullition is slowly raised till the desiredpoint is reached. The heights of F and Gr are then read, andone observation is com
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