The London, Edinburgh and Dublin philosophical magazine and journal of science . e the resistance of the elements is a matter of indiffer-ence, they may be made very small. I have filled glass tubes,8 centim. long and 5 millim. diameter, half with the copper-sulphate plaster and half with the zinc-sulphate plaster, wiresof copper and zinc being placed in the corresponding mixture,which wires were then soldered together, as shown in theaccompanying figure. The ends of the tubes are closed withparaffin. Twelve such elements form a such rows stand one behindthe other, each connected wi
The London, Edinburgh and Dublin philosophical magazine and journal of science . e the resistance of the elements is a matter of indiffer-ence, they may be made very small. I have filled glass tubes,8 centim. long and 5 millim. diameter, half with the copper-sulphate plaster and half with the zinc-sulphate plaster, wiresof copper and zinc being placed in the corresponding mixture,which wires were then soldered together, as shown in theaccompanying figure. The ends of the tubes are closed withparaffin. Twelve such elements form a such rows stand one behindthe other, each connected with thepreceding one by insulated binding-screws, so that each cbain of twelveelements hangs between two binding-screws. Any desired number of suchseries of twelve elements may there-fore be taken to produce the whole battery of 144 elementsshows a polar difference of potentialof 152 volts ; whereas the same difference requires 156 ele-ments of the freshly prepared water-battery and 200 of theenfeebled one. The whole dry battery covers a surface of16 centim. Postscript.—In the elements last prepared the zinc wiresare amalgamated at the ends and covered elsewhere withshellac, and the concentrated solutions have been diluted withone third of water. XXIV. The Molecular Volumes of Salt-Solutions.—Part of Crystallization. By W. W. J. NlCOL, , ,, Lecturer on Chemistry, Mason College,Birmingham*. IN my previous paperf on this subject I showed that themolecular volumes in solution of the metals sodium andpotassium, and those of certain acid-radicals—01, (S04),(N03), (CIO3), and (OH)—are constant in whatever waythese may be combined together to form salts, the essentialpoint to be observed being that the solutions are sufficiently * Communicated by the Author. t Phil. Mag. August 1883 ; Ber. der dent. Chem. Ges, xvii. p. 492. N2 180 Mr. W. W. J. Nicol on the Molecular dilute (less than one equivalent of salt to 100 molecules of
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