. Bulletin. , and slowly fell again toabout 1 during the re-mainder of the four reason for the anom-aly was that the conductingsurface of the cathodes be-came covered with a filmof iron rust which pre-vented contact with thesolution. At the end of two hoursthe solution seemed to besaturated with gas, mostof which, however, wasoxygen set free at theanode. Almost no evolu-tion of gas was visible atthe cathode. At the endof three hours, althoughonly the single anode wasused, placed between twobunches of five cathodesthe solution thus travers-ing ten thicknesses of wirecloth, the up
. Bulletin. , and slowly fell again toabout 1 during the re-mainder of the four reason for the anom-aly was that the conductingsurface of the cathodes be-came covered with a filmof iron rust which pre-vented contact with thesolution. At the end of two hoursthe solution seemed to besaturated with gas, mostof which, however, wasoxygen set free at theanode. Almost no evolu-tion of gas was visible atthe cathode. At the endof three hours, althoughonly the single anode wasused, placed between twobunches of five cathodesthe solution thus travers-ing ten thicknesses of wirecloth, the upstream sidesof the cathodes, which re-ceived the richest solution,were almost thoroughlycoated. xVt the end of fourhours the silver content ofthe solution had been reduced from to mg. per 100 c. c. ( per ton). At this point another bunch of five 30-mesh wire-cloth cathodes, making 25 in all, were added, also three perforated,peroxidized-lead anodes, making 4 in all. Then another charge of. 3 4 5 6 HOURS Fi« ike 14.—Electrodeposition results with carbonanodes and addition of KIIO to the solution:22 liters of solution used, containing gramsBLCy, 22 grama KHO, and grams Ag asBLAgCys; rate of flow, 360 liters per hour; veloc-ity through open box, 42 inches per minute;through cathodes, 95 Inches; anodes kept 4 daysin melted vaseline; each consisted of 7i-inchtra carbon rods, spaced 21 inches apart,Immersed to depth of 2 J inches; 14 cathodes,each being 5 sheets of ifj-mesh iron wire cloth;total area, -ijuare feet. USE OF CARBON ANODES. 63 silver cyanide and water was added to make 22 liters. The cathodesurface had been increased to square feet and the precipitationwas much more rapid than before. At the end of the fifth hour thenumber of cathodes was increased to 10 bunches of five each, or 50 inall. A new charge of silver c}ranide was then added. The cathodesurface having been increased to square feet, the rate of precipita-tion had in
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