. Bulletin. 069 grams of sheet goldand gram of amount of gold insolution not precipitatedwas grams, makinga total weight of Unfortunatelyin starting the experi-ment part of the richsolution was lost sothat a check was notpossible. Evidently, to recoverall the gold a higher voltage, say or volts, would have been necessary. Com-plete precipitation and recovery of the gold by electrolysis couldbe made at any time. This has been done time and time again, CO p U &>& a a o g •*-> — *- . •» ri N f ^ a s • *i a 3 £ ^ M g a>2 to a - 3 O O +J - •-
. Bulletin. 069 grams of sheet goldand gram of amount of gold insolution not precipitatedwas grams, makinga total weight of Unfortunatelyin starting the experi-ment part of the richsolution was lost sothat a check was notpossible. Evidently, to recoverall the gold a higher voltage, say or volts, would have been necessary. Com-plete precipitation and recovery of the gold by electrolysis couldbe made at any time. This has been done time and time again, CO p U &>& a a o g •*-> — *- . •» ri N f ^ a s • *i a 3 £ ^ M g a>2 to a - 3 O O +J - •- » .3 A eS .2 o o a ..3 —. 3 O a> -h r3 ft S 8 a H u s u da a m u o o Li ft ft O •_ • 2 © •?, 5 *>•* 0 >» o „ o liSsi3 HOURS 94 ELECTRODEPOSITION OF HOLD AND SILVER. so there is no doubt on that point. The sheets of gold adheringto the cathodes obtained here are a complete refutation of theclaim of Prof. Neumann that recovery of the gold in this manner Figlre 27.—Results of silver electrodeposition with cathodes andanodes horizontal. One perforated sheet-iron anode. One set offive 30-mesh iron wire-cloth cathodes, each 10 hy cm. ; totalarea of pervious part, 81 square cm.; area when covered withsilver was indeterminate. Rate of flow, 11 liters per minute or660 per hour ; velocity through open box, 53 inches per minute;through cathodes, 120. RECOVERY OF SILVER ON HORIZONTAL PERVIOUS CATHODES. All the electrodes previously considered were placed vertically inthe deposition box. It was now thought wise to see what could bedone in silver recovery by using horizontal pervious cathodes, withremovable pervious anodes above them. If this arrangement weresuccessful, a clean-up would be unnecessary, for the silver couldbe scooped up with a shovel. Such a construction is not so favorablefor deposition as the previous arrangement, for only one anode RECOVERY OF SILVER ON HORIZONTAL PERVIOUS CATHODES. 95 and one cathode can be used in
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