. Electric railway journal . TRANSFORMER MOUNTING tion of a telephone switchboard. The control of theheat conditions of the arc is made by using a shunt inthe magnetic circuit which can be readily moved by anadjustment handle. This feature of heat control main-tains a constant power consumption automatically forany given setting. The theory is that constant heat re-quires constant power, that is, the heat in the arc is theproduct of both the current and voltage across it. The following are some of the advantages claimed forthis type of machine: (1) Light weight and ease in. PLUG CONTACTS AND A
. Electric railway journal . TRANSFORMER MOUNTING tion of a telephone switchboard. The control of theheat conditions of the arc is made by using a shunt inthe magnetic circuit which can be readily moved by anadjustment handle. This feature of heat control main-tains a constant power consumption automatically forany given setting. The theory is that constant heat re-quires constant power, that is, the heat in the arc is theproduct of both the current and voltage across it. The following are some of the advantages claimed forthis type of machine: (1) Light weight and ease in. PLUG CONTACTS AND ADJUSTMENT HANDLE undling. The largest 60-cycle type weighs 250 lb. andcan be handled by two men. (2) No moving parts. (3)Low maintenance cost. (4) High efficiency. The trans-former is from 80 per cent to 90 per cent efficient and apound of mild steel can be deposited by this machinewith from II to 2i (5) Machines are designedfor use with any alternating-current power supply andfor any voltage. (6) Positive heat control, preventingburning of the metal or making of imperfect weldsthrough deficiency in heat. (7) High penetrative quali-ties for cutting. Steel Hardening Process Makes Substitutefor Manganese Specials APROCESS for hardening and carbonizing steel bythe direct application of an oxy-acetylene flame isbeing used with success by electric railways on the Pa-cific Coast. The most important application of the proc-ess made by the United Railroads of San Francisco isits use on special work which has been built up in theshops and which is then substituted fo
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