The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . as the roughened surfaceevolved the hydrogen far more freely. Taking advantageof this principle he coated platinum foil with a finely dividedblack powder of platinum, deposited from a solution ofthat metal by means of electricity, and used this in place of 104 THE PRACTICAL ELECTROPLATER. the copper in the common battery. Smee afterward madeuse of silver foil, which is much cheaper, in place of plati-num foil. The method of preparing these plates is
The practical electroplater A comprehensive treatise on electroplating, with notes on ancient and modern gilding, and formulas for new solutions . as the roughened surfaceevolved the hydrogen far more freely. Taking advantageof this principle he coated platinum foil with a finely dividedblack powder of platinum, deposited from a solution ofthat metal by means of electricity, and used this in place of 104 THE PRACTICAL ELECTROPLATER. the copper in the common battery. Smee afterward madeuse of silver foil, which is much cheaper, in place of plati-num foil. The method of preparing these plates is givenby Smee as follows : The silver to be prepared for this should be of athickness sufficient to carry the current of electricity, andshould be roughened by brushing it over with a little strongacid, so that a frosted appearance is obtained. It is thenwashed and placed in a vessel with dilute sulphuric acid, towhich a few drops of nitro-muriate of platinum have beenadded. A porous tube is then placed into this vessel, witha few drops of dilute sulphuric acid ; into this tube a pieceof zinc is put, contact being made between the zinc and. Smee Battery. silver ; the platinum will in a few seconds be thrown downupon the silver as a black metallic powder. The operationis now completed and the platinized silver is ready for simple method, obviating the use of a battery, is asfollows : Lay the silver between two pieces of sandpaper,press it with an ordinary smoothing iron, and then pull the THE SMEE BATTERY. 105 silver out while under the pressure. The platinum solutionis made very hot and the silver dipped in it for some time,
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisheretcetc, bookyear189
