. American foundry practice . 264 FEEDING AND SHRINKAGE OF MELTED IRON. SO that it does not go into the casting, which lets the neck ofthe feeder freeze. The rod should be kept down into thecasting, and let the iron as it freezes at the bottom push itup out of the casting. There are often cases where the iron or wooden bars of aflask will not admit of a projier-sized feeder. In such caseswhere the bars cannot be readily widened, the feeder shouldbe built up in length, to make up for the loss in small feeder closes quicker and takes more, hot iron tokeep it open than a large one. Lar
. American foundry practice . 264 FEEDING AND SHRINKAGE OF MELTED IRON. SO that it does not go into the casting, which lets the neck ofthe feeder freeze. The rod should be kept down into thecasting, and let the iron as it freezes at the bottom push itup out of the casting. There are often cases where the iron or wooden bars of aflask will not admit of a projier-sized feeder. In such caseswhere the bars cannot be readily widened, the feeder shouldbe built up in length, to make up for the loss in small feeder closes quicker and takes more, hot iron tokeep it open than a large one. Large feeding heads requireless work and attention than small ones. With feeders 10and upwards, as soon as the casting is poured, put in thefeeding rod and work it around for a minute or two to workthe dirt up to the surface. Then take the iron dipper, asshown at D, of which a shop should have three or four sizes—the dished part being about 2 deeper and the handles about 4feet long—and dip out the dirt and as much of the dul
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