The Philosophical magazine; a journal of theoretical, experimental and applied physics . iment 1. fig. 1.—db is a Fig. 1. single cell of the nitric acid battery, ^ exposing six square inches of eachmetal; t; is an ordinary voltameter,each electrode exposing half asquare inch, charged with dilutesulphuric acid; decomposition wasallowed to proceed with this ar-rangement for six hours: the bat-tery, for greater assurance of con-stancy, being in this and the twofollowing experiments rechargedevery two hours; the level of theliquid in the voltameter was carefully marked on the tube. Experivie7it 2.
The Philosophical magazine; a journal of theoretical, experimental and applied physics . iment 1. fig. 1.—db is a Fig. 1. single cell of the nitric acid battery, ^ exposing six square inches of eachmetal; t; is an ordinary voltameter,each electrode exposing half asquare inch, charged with dilutesulphuric acid; decomposition wasallowed to proceed with this ar-rangement for six hours: the bat-tery, for greater assurance of con-stancy, being in this and the twofollowing experiments rechargedevery two hours; the level of theliquid in the voltameter was carefully marked on the tube. Experivie7it 2. Fig. 2. fiff. 2. is the scnnenitric acid battery,d h the same volta-meter v^ but withan interposed pairof large platinumplates, a c, expo-sing; each to eachforty-two squareinches of surface,and immersed indilute sulphuricacid: this arrange-ment was also set towork for six slight evolutionof gas had takenplace in the volta-meter in this expe-riment, and thewater-level was alsomarked. Expefimeyit 3.—The same appara-tus as fig. 2 ; butmy assistant was di-rected to change at. Mr. Grove oji Voltaic ReactW7i. ^io a certain interval the wires dipping into the mercury cups gg,so as to reverse the plates a c, with regard to the direction ofthe current, making what was the anode the cathode, and viceversa, as shown by the dotted Hues; and at the expiration ofa similar interval to restore them to their original positions,and to continue thus alternating the position of these plateswith reference to the current during six hours. The interval was to be dependent upon tiie following ob-servation :—When first the circuit was completed, a markedevolution of gas was perceptible in the voltameter, this gradu-ally subsided, and when it had become nearly imperceptiblethe change was to be made, when a fresh burst of gas tookplace, as this again subsided the wires were to be againchanged, and so on. At the expiration of six hours the water-level was marked, as in the previous experime
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