Fig. 3029.
Fig. 3030.
Fig. 3031.
“This difficulty of proportioning the part of the crank first forged to the size of the neck, will be still better understood by the appearance of it in the furnace, as shown in [Fig. 3028]. Having reached this stage, with one end of the shaft completed, as also that portion of the crank itself which of necessity was completed before the collar was cut, in order that the neck might be finished, no more iron can be added on the top edge, as it is up to the full depth already; it must therefore be added on the flat, as in [Fig. 3029], where the piece is shown on its flat side in the furnace, the finished portion being outside the furnace door. A number of slabs s s s are then placed side by side to bring out the width of the crank further; these being welded down, the piece is turned upside down, and the process repeated on the other side. Afterwards other slabs are similarly placed on both sides, as shown in [Fig. 3030], of which one is the flat, and the other is the edge view of the crank at this stage; and this is continued until sufficient iron has been massed to allow of the other gable of the crank being cut down, as at a, [Fig. 3031], and sufficient also to allow of the other part of the body b being rounded and prepared for further piecing out.
