. Bulletin. près avoir l'ajout d'une nouvelle accusation d'argent à la fin de l'twohours. 0 3 4 heures Figure 8.-Eleetrodeposition withrate avec solution d'argent Résultats de débit de 120 litres par heure et plus grande zone cathode.Vitesse de passage, 19 pouces par minute grâce à open box,42 pouces par 22 cathodes cathodes ; utilisé de 30-meshwire chiffon et 2 nouvelles cathodes, chacune de 10 feuilles de 1-mm. tissus ; les fils d'une cathode, cm2. Surface effective estimée ; 42 de cathodes, 4.2 pieds carrés. 56 L'ÉLECTRODÉPOSITION D'OR ET D'ARGENT. La figure 9 montre les résultats d'une tentative d'accroître l'iiow de so

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. Bulletin. fter adding a new charge of silver at the end of twohours. 0 3 4 HOURS Figure 8.—Eleetrodeposition results with silver solution withrate of flow of 120 liters per hour and larger cathode area.Velocity of flow, 19 inches per minute through open box, 42 inches through cathodes ; 22 used cathodes of 30-meshwire cloth and 2 new cathodes, each of 10 sheets of 1-mm. wire cloth; actual wire surface of one cathode, sq. cm. ; estimated effective surface of 42 cathodes, 4.2 squarefeet. 56 ELECTRODEPOSITION OF GOLD AND SILVER. Figure 9 shows the results of an attempt to increase the iiow of solu-tion t 1 SO liters per hour. The whole of the solution passed throughthe box nearly nine times in one hour, and as the box held abouta liter, an amount equal to 180 times the volume of the box passedthrough in each hour. Forty wire-cloth cathodes and seven wire-clothanodes were used in this experiment. The cathodes were 3.5 by 2.0inches square and had a total surface area of 6.38 square feet. It. 0 12 3 4 HOURS Figure 9.—Electrodeposition results with silver solution with rate of flow of 180 litersper hour; velocity, 20 inches per minute in open box, 45 inches through cathodes; 7anodes of 8-mesh wire cloth ; 40 cathodes of 30-mesh wire cloth; actual surface area, 6.38 square feet. will be noticed that the precipitation curves show that the capacityof the box increased rapidly, a new charge being added at the endof two hours and another at the end of five hours. The voltage dur-ing the first two hours was 3, and during the rest of the time 4. Theprecipitation curves show successively better results. A- the precipitation became more effective, another feature no-ticed was that free cyanide was regenerated from the cyanide com- PRELIMINARY EXPERIMENTS. 57 bined with the precipitated silver. This feature was seen for thefirst time in the experiment represented in figure 10. In this experi-ment the flow of solution was increased to 300 liters per hour. Theentire solution passe

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