. Locomotive engineering : a practical journal of railway motive power and rolling stock . other. When theheat is ready the pieces are taken to thehammer, the helper laying the stub in thelower die and the smith placing the rodon it, lapping the cut scarf more or less,according to the diameter of the iron be-ing welded, and after starting the hammerthe weld is finished in about 50 secondsfrom furnace to completion. In connec-tion with this work we had rather anamusing experience. The smith madecomplaint that the iron became so hotwhile he was hammering that it wouldcnirrphn-ps melt and run. An
. Locomotive engineering : a practical journal of railway motive power and rolling stock . other. When theheat is ready the pieces are taken to thehammer, the helper laying the stub in thelower die and the smith placing the rodon it, lapping the cut scarf more or less,according to the diameter of the iron be-ing welded, and after starting the hammerthe weld is finished in about 50 secondsfrom furnace to completion. In connec-tion with this work we had rather anamusing experience. The smith madecomplaint that the iron became so hotwhile he was hammering that it wouldcnirrphn-ps melt and run. An investiga- 269^ QUESTIONS ANSWERED. Correspondents wishing to have ques-tions answered in these columns shouldsend in their names and addresses, not forPublication, but for evidence of good throw all anonymous letters into th*waste basket. (56) L. J. C, Trinidad, Colo., asks:What is the proper shrinkage to allow ondriving tires? A.—The American Rail-way Master MechanicsAssociation recom-mends the following allowances: Diameter of center,inches .Shrinltage allowance,, BALDWIN ELECTRIC MINING LOCOMOTIVE. Depressing the treadle to a horizontalposition, as shown in Fig. i, closes valve Band opens the throttle so that the hammerwill strike its maximum blow in this posi-tion. A further depression of the treadlewill open the other port of valve B, ex-hausting the air from the balance cylinder,allowing its piston to descend by reason ofthe higher pressure on the B, having a certain amount of lap,or, in other words, a movement in thecentral position without opening eitherport, allows a graduation of the throttleto suit the work in hand. The regulator is also easily controlled,as It is not necessary to admit or exhaustall of the air in the balance cylinder at anyone time, but it can be graduated eitherway, giving a corresponding movement tothe regulator. As soon as we had gotten our largepneumatic hammers to work we found thatit was not necessary to he
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
