. Carnegie Institution of Washington publication. OF THALLIUM, INDIUM, AND TIN 15 THE CELL. The multiple cell used in all the measurements of electromotive force is shown in fig. 4. This apparatus, devised by Richards and Forbes, must be very carefully annealed, for even at the best the glass receptacle is very fragile. The body of the vessel is used to hold the electrolyte; the four cups contain the amalgams to be measured. The advantage of the four cups is obvious: six different measurements may be made at one filling, and at the same time important checks can be secured on the accuracy of t
. Carnegie Institution of Washington publication. OF THALLIUM, INDIUM, AND TIN 15 THE CELL. The multiple cell used in all the measurements of electromotive force is shown in fig. 4. This apparatus, devised by Richards and Forbes, must be very carefully annealed, for even at the best the glass receptacle is very fragile. The body of the vessel is used to hold the electrolyte; the four cups contain the amalgams to be measured. The advantage of the four cups is obvious: six different measurements may be made at one filling, and at the same time important checks can be secured on the accuracy of the Fig. 4. Amalgams in Cell ready for Potential Measurement. The glass receptacle was carefully cleaned and dried, and fused at A to the delivery tube of an apparatus supplying pure hydrogen. A vacuum pump was now attached at S2 and the whole cell exhausted as far back as the stopcock 6\. The tops of the tubes, B, C, D, and E were closed with small pieces of rubber tubing and glass rod. When the pressure had been reduced to about 20 mm., the stopcock S2 was closed and the cell allowed to fill with hydrogen through S^. This was repeated four times. The glass rod was now removed from one of the tubes and the fine tip of a pipette, containing the proposed electrolyte, inserted. The issuing stream of hydrogen prevented the diffusion of air into the cell. When the vessel was about half full of the aqueous solution, the pipette was withdrawn and the stopper was replaced. In the same manner suitable amounts of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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