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EMBOSSED WORK p.145 of the leaf from the eyes to the rib is now measured along the dotted lines, allowing a little extra for the bend of the leaf. The distance found is then laid out on the horizontal lines on the pattern. The general shape of the leaf may now be sketched in and the pattern cut out. Fig. 91 shows a leaf modeled from No. 20 soft steel, and Fig. 92 shows a drawing of the same leaf flattened before it is hammered in any way. To model this leaf it is heated red and with the ball of a good-sized modeling-hammer it is hammered on the end grain of the block to give it the general shape. It is then annealed, and when cold the rib and pipes are raised. To do this they are sketched on the under side of the leaf with a slate pencil and then hammered in a sinking-tool with a sink about 1/4 in. wide and a scant 3/16 in. deep. The leaf is set onto the tool with the pencil marks up and directly over the sink. With the peen of the modeling-hammer the metal is driven into the sink, starting at the top of the leaf and continuing for a distance of two-thirds of its length. A smaller sink is now used to raise the rest of the rib. The pipes are next raised, starting with the large sinking-tool at the eye and using the smaller one as the pipe nears the rib. The lobes or leaflets are next raised. This is done on the lead block by hammering from the under side of the leaf with peen and ball of hammer. The sinking-tools are |
Hand Forging by Thomas F. Googerty