The Philosophical magazine; a journal of theoretical, experimental and applied physics . on Institution, and anotherportion belonged to Mr. Gassiot, and was by him very kindlyplaced at my disposal for the purpose of these experiments;had it not been for this valuable addition, I should have beenobliged to make all my experiments on a much smaller scale;thev would have taken more time and been by no means sosatisfactory. As I have already stated, a thirdform has occurred to me while writingthis paper, which I think in many re-spects more advantageous than eitherof the two preceding, and which,
The Philosophical magazine; a journal of theoretical, experimental and applied physics . on Institution, and anotherportion belonged to Mr. Gassiot, and was by him very kindlyplaced at my disposal for the purpose of these experiments;had it not been for this valuable addition, I should have beenobliged to make all my experiments on a much smaller scale;thev would have taken more time and been by no means sosatisfactory. As I have already stated, a thirdform has occurred to me while writingthis paper, which I think in many re-spects more advantageous than eitherof the two preceding, and which, asit may be some time before I can ex-periment with it myself, I will heredescribe for the benefit of those whoare differendy situated. One cell ofit is shown in fig. 8: «, a, is a Woulfesbottle with three necks ; in the centreneck is fitted a glass stopper, b; inthe other two the tubes u, h fit accu-rately by means of glass collars [c c,fio-. 9) welded to them and ground onthe outside; the platinum is hermeti-cally sealed into the tops of the tubes,which may be charged in a similar. Mr. Grove on the Gas Voltaic Batterjj. 273 manner to fig. 1. By immersing this apparatus in the water-trouo-h, each tube with the gas it contains may be detached andexamined separately, but its principal advantage is, that byslightly greasing the stopper and collars it may be made per-fecdy air-tight, which, for reasons that will be apparent in thecourse of this paper, is a most material point. This appa-ratus, moreover, being entirely composed of glass and plati-num, concentrated acid, alkaline or other corrosive solutions,may be used as the electrolyte, without damaging the appa-ratus or introducing foreign matter. In the experiments I am about to describe, the results weregenerally tested by chemical action, as manifested by the elec-trolysis, either of iodide of potassium or of water. I had atmy disposal a highly sensitive astatic galvanometer, but I foundsuch slight local actions disturb it,
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