Canadian foundryman (1917) . ies transformers, and one motor withshafting- etc. ELECTRIC FURNACE EQUIPMENTTill, constant broadening of the commercial field of the electric furnace isdue largely to the perfecting of furnacedesign and reduction in cost of their former use was princi-pally in the refining of high grade alloyand tool steels, they are now being morewidely used for the refining of commoncrrades of steel. Improved devices forcharging and tilting, larger electrodes,and automatic regulation all tend to•greater economy. While many different designs of furn-ace are in exis
Canadian foundryman (1917) . ies transformers, and one motor withshafting- etc. ELECTRIC FURNACE EQUIPMENTTill, constant broadening of the commercial field of the electric furnace isdue largely to the perfecting of furnacedesign and reduction in cost of their former use was princi-pally in the refining of high grade alloyand tool steels, they are now being morewidely used for the refining of commoncrrades of steel. Improved devices forcharging and tilting, larger electrodes,and automatic regulation all tend to•greater economy. While many different designs of furn-ace are in existence, they can be groupedin two general classes, the inductionfurnace and the arc furnace; the latter,in sizes from one-half to 20-tons hav-ing been adopted almost exclusively inAmerican practice. The Electric & East Pittsburgh, Pa., has developedcomplete electrical equipments tor al!classes of furnace, that for the arc typeof furnace, assuming high tensionaternatine current is available, includ-. MOTOR WITH BRAKE GEAR AS USED ON ELECTRIC FURNACE 56 C A N A I) I A N V () T N I) R Y M A N Damping devices permit the regulatorto act only when necessary, and suddenchanges and peaks of short duration donot put the regulator in action. Thisin itself is very important, as there isnot only a great saving in the wear andtear of the electrodes hoisting motors lor driving same, etc., butfhe current is kept more uniForm byavoiding unnecessary regulation. Kach regulator controls one regulator is controlled by a solenoidenergized by means of current from-cries transformers in the main hightension circuit. The regulator in turncontrols the armature circuit of the elec-trode motor to give it motion in either special steels, for steel castings, andalso for means of extracting chromiumand nickel from the vast quantities ofsteel turnings containing these alloys,which are being made in the munitionshops. For all these purposes the elec-tric furnac
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