Modern electro plating The principles involved in depositing gold, silver, nickel, copper, brass and other metals, by means of batteries or dynamos; the preparation and management of plating baths, chemicals used, etc . ring to them is allowed to remain in the barrel,where it acts as a polishing powder, brightening theparts which are not reached by the metal of other cast-ings; but when tumbling for a bright finish, the sand, dirt,etc., are exhausted by means of the blower, so that thesurfaces are finely polished by friction only—burnished,as it were, by rubbing against other metal of the same
Modern electro plating The principles involved in depositing gold, silver, nickel, copper, brass and other metals, by means of batteries or dynamos; the preparation and management of plating baths, chemicals used, etc . ring to them is allowed to remain in the barrel,where it acts as a polishing powder, brightening theparts which are not reached by the metal of other cast-ings; but when tumbling for a bright finish, the sand, dirt,etc., are exhausted by means of the blower, so that thesurfaces are finely polished by friction only—burnished,as it were, by rubbing against other metal of the samekind. A strong exhaust should be kept up when polish-ing in this way, or the finish will be dead instead ofbright. It is a principle in burnishing that you cannotget the burnished surface smoother than the burnisher,so that a little consideration will show that bright workis only obtained by long-continued tumbling, and thebright finish comes rather quickly after all the piecesin the barrel have become smooth. It is, therefore, MODERN ELECTRO PLATING. 55 necessary to handle the work in batches, and not toadd more work after the batch has been some time inthe barrel, or the work will not finish evenly, and time. Fig. 2i.—Egg-Shaped Tumbling Box. will be lost instead of gained. The speed should beregulated so that the articles may have time to slipdown upon and slide over each other as much aspossible. If .the barrel turns too fast they will hug 56 MODERN ELECTRO PLATING. the sides of the barrel and be carried around with it;about 40 to 60 revolutions per minute is correct; if tooslow, the action is unnecessarily prolonged. Fig. 21shows a new form of tumbling barrel far superior toanything else within our knowledge. The barrel is egg-shaped; it has a section of exhaust pipe connectedto the hollow journal at one end and a tight and loosepulley at the other end. No gearing whatever is special advantages are found in the egg-shape: It gives the contents a double motio
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectro, bookyear1897
