FORGING PROCESSES 49
piece the stock should be about 3-1/2 in. wide by 3/8 in. thick. The method in forging this piece is first to split the bar with a thin hot chisel as shown at B. It is then fullered about 1 in. below the split part and drawn out, or the extra stock cut off, as at C. The piece is next heated and the outside is spread as at D. It is then finished to size. Another form of solid forging is shown at E. The piece is split and fullered as at F, the bottom part is drawn out, and the split ends hammered as shown at G. It is then heated and worked into shape with the hand hammer.
Shrinking Bands. — If a band of iron is heated, its circumference will expand. If it is then
Fig. 21. Traveler, or Tire-Measuring Wheel
driven onto a piece of round iron and cooled with water, it will shrink to its original size and become tight. The method of shrinking on bands is first to find their length. This may be done by measuring with a string around the piece that is to