. The Street railway journal . ly,however, it is swept down by the current and small particlesare lodged in the rim, where they injure the chill or are thestarting points for shelled-out spots. Chill cracks are now sufficient reason for the rejection of awheel. In this connection it is interesting to quote from adiscussion on the subject before the Master Car BuildersAssociation in 1877. One manufacturer is reported as sayingthat he did not consider a small chill crack any injury to thewheel across the tread or in the flange, provided the latter didnot run down into the tread. Another, a user,
. The Street railway journal . ly,however, it is swept down by the current and small particlesare lodged in the rim, where they injure the chill or are thestarting points for shelled-out spots. Chill cracks are now sufficient reason for the rejection of awheel. In this connection it is interesting to quote from adiscussion on the subject before the Master Car BuildersAssociation in 1877. One manufacturer is reported as sayingthat he did not consider a small chill crack any injury to thewheel across the tread or in the flange, provided the latter didnot run down into the tread. Another, a user, did not objectto the chill cracks unless they were pretty wide, for instance,a quarter of an inch across; while a third, and a very prom-inent member of the association said: There is no doubtin my mind, from the experience I have had with chill-cracked wheels, that it is the most mistaken idea that railroadmen ever got into their heads, that a chill crack in a wheelinjures it materially. I have always understood, and I think. SECTION OF WHEEL, SHOWING INCIPIENT FRACTURE it is common sense, that the best iron for wearing is the ironthat chill cracks. But this was in the days of light cars. Atpresent chill cracks are not accepted, and wheels are rejectedat the foundry if they are defective in this regard. Sweat or beads, sometimes also called cold shot, takes theform of small shot, smooth and round, and is sometimes foundin the chilled portion of a cast wheel, usually on the surface,and most frequently in the throat of the flange. This, likethe wrinkle, does not necessarily involve the rejection of thewheel, if it is not too deep—a flexible limitation that de-pends for its application on the personal equation ofthe inspector. This shot is supposed to be formed by thesolidification of the metal while it is in a spheroidal condition—resembling drops of water that have fallen upon a hot stove. From this resume of the diseases to which the cast-ironwheel is heir, it will be see
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
