. Bulletin. of flow, 8 liters per minute; velocity through open box, 46inches per minute; through cathodes, 105. Note fall of cyanide during solution ofgold and slight rise during fall of gold. start was decidedly satisfactory for the whole period. The currentwas rather low because the solution was a new one used for the first f: 31g. W \ ff \ —\ fe \ /I \ if f, 9 mg n 0r203 er cei cen i i \ \ ; mf?. \ \ V iltag \ rolts v —1 . amp eres Vt \* a I \ \ \ \ \ ; £ ) ( 0^3 Cut rent amf exea ^ , mg. —_d DEPOSITION OF
. Bulletin. of flow, 8 liters per minute; velocity through open box, 46inches per minute; through cathodes, 105. Note fall of cyanide during solution ofgold and slight rise during fall of gold. start was decidedly satisfactory for the whole period. The currentwas rather low because the solution was a new one used for the first f: 31g. W \ ff \ —\ fe \ /I \ if f, 9 mg n 0r203 er cei cen i i \ \ ; mf?. \ \ V iltag \ rolts v —1 . amp eres Vt \* a I \ \ \ \ \ ; £ ) ( 0^3 Cut rent amf exea ^ , mg. —_d DEPOSITION OF GOLD ON WIRE-CLOTH CATHODES. 89 time, and did not contain so many dissolved salts; the current wasrelatively better after a while because the contacts were better. Thefall of the cyanide during the solution of the gold and the slightrise during its rapid precipitation should be noted. The rise was lessthan the fall, owing to continuous 0 12 3 4 HOURS Figubb 24.—Electrodeposition results with rich gold solution. Solution, liters,containing mg. Au per 100 c. c. Six carbon comb anodes; seventy (14 groupsof 5) 16-mesh wire-cloth cathodes; total estimated surface area, between 2 and10 square feet. Rate of flow, 8 liters per minute or 480 per hour; velocity throughopen box, 46 inches per minute ; through cathodes, 105. The next experiment was made with 14 bunches of five cathodes of16-mesh wire cloth. The total area of these was estimated to bebetween to square feet. They were gold coated fromprevious use. Six carbon anodes were used. The solution per cent KCy and per cent KHO. The flow was 8 liters perminute. The solution at the start contained mg. gold per liter, 90 ELECTRODEPOSITION OF GOLD SILVER. but owing to bad contacts, the gold dissolved, so that the content inthe solution increased t mg. The ampere-hour efficiency underthese conditions (see also
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