The polishing and plating of metals; a manual for the electroplater, giving modern methods of polishing, plating, buffing, oxydizing and lacquering metals, for the progressive workman . fiftv amperesup to five hundred amperes. They are giving satisfactionin these sizes when used on electric lighting circuits in citybuildings. They have not had extended trial in hard work-in large sizes, and hence we cannot speak positively in re-gard to their performances under adverse working condi-tions and heavy currents. Still it forms a very useful ma-chine for small work in cities and for shops which hav
The polishing and plating of metals; a manual for the electroplater, giving modern methods of polishing, plating, buffing, oxydizing and lacquering metals, for the progressive workman . fiftv amperesup to five hundred amperes. They are giving satisfactionin these sizes when used on electric lighting circuits in citybuildings. They have not had extended trial in hard work-in large sizes, and hence we cannot speak positively in re-gard to their performances under adverse working condi-tions and heavy currents. Still it forms a very useful ma-chine for small work in cities and for shops which have anelectric distribution of power. If the conditions of use have been electrically measured, itis practicable to wind a machine so that it will have a con-stant voltage under those conditions. This is being donefor large establishments which are in charge of electro-chemists, but it is manifestly impossible to do it where theelectrical conditions are not known beforehand. Havingthus briefly sketched the progress in windings for voljtageand output we will now glance at some other matters oiconstruction. 156 THE POLISHING AND PLATING OF METALS. gr 5 •a o o H C •< BS3 3 o 2. THE POLISHING AND PLATING OF METALS. 157 The original machines had hut two poles and two brushes;this method of construction has continued to the present dayin the smaller machines and with some manufacturers in allsizes. When the lighting engineers entered the field for theproduction of heavy current at high pressure, they objectedto this method. They contended that it was better to addmore poles and brushes and reduce the speed of driving thearmature and commutator, holding that the advantagesgained in use more than offset the cost of the extra numberof parts; the machine could be made to weigh less andventilation was better. The advocates of the bipolar typeclaimed greater efficiency, by avoiding eddy currents andheating, due to the rapid reversal of currents in the armaturecoils so many times in ea
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectro, bookyear1904
