. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . angement to hold therods in place, as they are heavy enough, when equippedwith the electrodes, to remain in any position they areplaced in. The electrodes of a plating vat should be of the samemetal that is to be deposited. Thus, if we desire to cop-per plate, copper electrodes should be used; if we wishto nickel plate, nickel electrodes should be used, etc. Forthis reason, it will be found necessary to construct three Electro-Plating 129 sets of el
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . angement to hold therods in place, as they are heavy enough, when equippedwith the electrodes, to remain in any position they areplaced in. The electrodes of a plating vat should be of the samemetal that is to be deposited. Thus, if we desire to cop-per plate, copper electrodes should be used; if we wishto nickel plate, nickel electrodes should be used, etc. Forthis reason, it will be found necessary to construct three Electro-Plating 129 sets of electrodes for use with the vat; one set of copper,one of nickel, and one of silver. Owing to the greaterexpense of silver, the electrodes of this metal are mademuch smaller than those of nickel and copper, and onthis account it will be found necessary to plate one arti-cle at a time when depositing silver. As the silver plat-ing solution is equally expensive, the amount preparedshould only equal one-third that of the copper or nickelsolutions, and the silver electrodes should be suspendedinto the solution by means of longer strips than those. Fig. 89—An electro-plating dynamo used on the other electrodes so they will be completelyimmersed. The dimensions of the various electrodesand the method of suspending them from the brass rodsare plainly sho^^m in the sketch. While three Bunsen cells connected in series Avill befound to produce sufficient current to successfully oper-i ate the vat described above, the use of a small 8-ampere,10-volt dynamo of the shunt-wound variety is to be rec-ommended on account of the steady and unvarying cur-rent it is capable of generating. It is utterly impossibleto use dry cells, as they polarize too rapidly for work ofthis nature. A small rheostat should be included in the 130 Model Engineering outfit, as it is often necessary that the cnrrent be properlyproportioned for the work required from it. Successful electro-plating depends, to a great ex
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