. Bulletin. , while the side creceives the deposit as a whole. The part marked a being subjectedto such action as occurs upon any anode, is liable to be attacked by Figure 34.—Arrangement forcompound electrodes, a, An-ode ( + ) ; ft, neutral part(o) ; c, cathode ( —) ; C\, pervious elec-trodes ; e, simple perviousanode; e3, simple perviouscathode. 136 ELECTE0DEP0SITI0N OF COLD AND SILVER. the solution unless made of some substance insoluble in the elec-trolyte. In cyanide solutions coke whiskers and excelsior charcoalhave been found sufficiently resistant to act as anodes at any or
. Bulletin. , while the side creceives the deposit as a whole. The part marked a being subjectedto such action as occurs upon any anode, is liable to be attacked by Figure 34.—Arrangement forcompound electrodes, a, An-ode ( + ) ; ft, neutral part(o) ; c, cathode ( —) ; C\, pervious elec-trodes ; e, simple perviousanode; e3, simple perviouscathode. 136 ELECTE0DEP0SITI0N OF COLD AND SILVER. the solution unless made of some substance insoluble in the elec-trolyte. In cyanide solutions coke whiskers and excelsior charcoalhave been found sufficiently resistant to act as anodes at any ordinary\ oltage without protect ion. The aerated solution has the same solventaction upon gold and silver as does a pure solution of the samestrength. Such compound, pervious electrodes may also be termed perviousbipolar electrodes. They have a great advantage over the simplepervious cathodes. Thus a box requiring a potential drop of with a 110-volt current can be arranged with 40 current gaps—. Figcue 35.—Arrangement of apparatus for use with compound electrodes, e, Simplepervious anode ; d e-2, compound pervious cathode, and ez, simple pervious letters same as in figure 30. namely. 1 pervious anode, 39 compound pervious electrodes, and 1simple pervious cathode. There being only two electric connectionsto be made, any intervening compound pervious electrode can beremoved and replaced as often as convenient without interruptingthe current. If the simple pervious cathode at the end is to be re-moved, an uncharged one can be placed in front of it and connectedwith the negative pole, when the other can be removed from thecircuit. A direct-current service of 220 volts has been used, but Ido not recommend so high a voltage, on the whole, on account ofthe inconvenience to those working at the deposition box. It is,however, easy to protect ones self from shocks by wearing rubber-soled shoes, or, if necessary, rubber gloves. The 110-volt currentgives no inc
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