Electrochemical and metallurgical industry . nto use thetwo older methods above mentioned, «. c, changing the fieldstrength or inverting resistance. The ideal regulation is obtained by having the fields of thegenerator separately excited from a high-voltage Circuit, asby this method, in addition to the regulation above referredto, a certain further variation can be obtained by weakeningor strengthening the field by means of a field rheostat operat-ing on a line not controlled by the speed of the generator it-self; and for generators of 500 amperes or more the generatorcan be arranged to use th
Electrochemical and metallurgical industry . nto use thetwo older methods above mentioned, «. c, changing the fieldstrength or inverting resistance. The ideal regulation is obtained by having the fields of thegenerator separately excited from a high-voltage Circuit, asby this method, in addition to the regulation above referredto, a certain further variation can be obtained by weakeningor strengthening the field by means of a field rheostat operat-ing on a line not controlled by the speed of the generator it-self; and for generators of 500 amperes or more the generatorcan be arranged to use the three-wire system, by which twoor three different voltages can be obtained from the machineat the same time. Armored Stoneware Cocks and Spigots It has often been emphasized by the most successful chem-ical and electrochemical engineers that they experienced theirgreatest troubles in the solution of the numerous small prob-lems in details of mechanical construction. A process maywork extremely well in its experimental stage, but when its. ARMORED STONEWARE BOCK. operation is started on a large scale, innumerable troubles areexperienced from such little things as leaking and wearing outof cocks and spigots. The accompanying illustration shows aninteresting and novel construction of ar-mored stoneware cocks and spigots, madeby the firm of Karl Ruppel in Hoechst-am-Main, Germany, in conjunction witli theGerman Stoneware Factory, of Friedrichs-feld, Baden, this latter concern being rep-resented in this country by F. Bertuch & New York. Lead cocks are often liable to wear outquickly, while cocks of pure earthenwareare difficult to construct for a high construction shown in the illustrationcombines earthenware and lead construc-tion, and is of extreme compactness and ofgreat strength. It may be used with veryhigh pressures instead of expensive hard-lead valves. The cock itself is made <ifstoneware armored with lead, the Hanges ofthe connecting pipe being joined
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
