. American engineer and railroad journal . ain on the wheel until it becamecool (55 minutes), all the heat, excepting that which was radiatedfrom the outside of the ring, being absorb, d by the wheel cast-ing, which was so hot at the expiration of that time that it wasuncomfortable to bear the hand on it. The wheel stood the testwithout cracking or showing any signs of injury. It will thus be seen that in these experiments the two spokewheels stood the thermal test without breaking, which is addi-tional testimony to the fact, which was suggested in the articlereferred to, that the capacity of
. American engineer and railroad journal . ain on the wheel until it becamecool (55 minutes), all the heat, excepting that which was radiatedfrom the outside of the ring, being absorb, d by the wheel cast-ing, which was so hot at the expiration of that time that it wasuncomfortable to bear the hand on it. The wheel stood the testwithout cracking or showing any signs of injury. It will thus be seen that in these experiments the two spokewheels stood the thermal test without breaking, which is addi-tional testimony to the fact, which was suggested in the articlereferred to, that the capacity of cast-iron wheels to resist suchtests as have been described depends very much upon the formof the wheel, which opens up the interesting inquiry, what is thebest form for such wheels? The experiments here described have great interest in the con-sideration of a reply to this inquiry. If it is true that spokewheels are less liable to break than plate wheels it is an importantfact and one which it would be worth while to prove by experi-ment. shown, did not crack until the rims had been subjected for a con-siderable time (two minutes) to continuous heat, wheels of theusual Washburn pattern cracked almost instantly after themetal was poured around the rim, the fractures occurringthrough both the ribs and rim, which indicates, as was inti-mated in the article referred to, that the form of the wheel has DEFECTS AND IMPEOVEMENTS IN LOCOMOTIVES, Notwithstanding the wonderful development of the locomotiveand what it has accomplished for civilization and the welfare ofmankind it must be admitted that it still has many defects, andsome of us are still sanguine enough to think that it is susceptibleof further improvement. It may be said, for example, that a pound of average coal con-tains sufficient potential heat to evaporate about IZi pounds ofwater. It will not be far out of the way to say that in ordinarypractice the average evaporation is not more than half thatamount of water per pou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
