. The London, Edinburgh and Dublin philosophical magazine and journal of science. osing-cells likethat represented in fig. 1, and all other forms of glassware de-scribed in this paper, are made by the New England Glass-Com-pany of East Cambridge, and can be ordered through any of the E2 52 Prof. J. P. Cooke on Lecture Experiments. dealers in philosophical apparatus in Boston. A much simplerdecomposing-cell, although not quite so efficient an apparatus,can be made with a common U-tube supported on a woodenstand and mounted with rubber stoppers, delivery-tubes, andplatinum electrodes in every re
. The London, Edinburgh and Dublin philosophical magazine and journal of science. osing-cells likethat represented in fig. 1, and all other forms of glassware de-scribed in this paper, are made by the New England Glass-Com-pany of East Cambridge, and can be ordered through any of the E2 52 Prof. J. P. Cooke on Lecture Experiments. dealers in philosophical apparatus in Boston. A much simplerdecomposing-cell, although not quite so efficient an apparatus,can be made with a common U-tube supported on a woodenstand and mounted with rubber stoppers, delivery-tubes, andplatinum electrodes in every respect like the other. The second point to be illustrated in regard to hydrochloricacid is, that it consists of equal volumes of its constituent gases ;and although by our first experiment, if made in the way wehave described, it is shown that the gases are evolved in nearlyequal proportions, yet a second experiment is required to esta-blish the absolute truth* of this important fact. The apparatuswe use for this purpose is represented in fig. 5, and the details Fig. 5. Fig. i^ of the several parts are shown in fig. 6. The two gases are * We here of course leave out of view the small difference which arisesfrom the fact that the gases do not absolutely obey Mariottes law, and aretherefore unequally condensed even by the atmospheric pressure. Thevolumes of the two gases would undoubtedly be exactly equal under greatlydiminished pressure; but under the pressure of the air the volume of themolecular weight of chlorine is about y^-g-iless than the corresponding volumeof the molecular weight of hydrogen, a difference by no means inappreciablein accurate experiments. Prof. J. P. Cooke on Lecture Experiments. 53 evolved together from a simple decomposing-cell, shown morein detail in fig. 9, but in connexion with another apparatus; andthe connexion of the battery with the two electrodes is heremade as before shown in fig. 2. The mixed gases pass througha small drying-tube filled wit
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