Fig. 52.
In fig. 53 A represents a good joint, B a bad one. Bend it round and cut it
off similarly at E. Common sense will tell you that you must get the angle correct by marking it with a slight incision of the knife in its place before you take it on to the bench for the final cut.
Slip it in, and push it in nice and tight, and put in piece No. 2.
Fig. 53.
But now look at your cut-line. Do you see that the inner edges of pieces 2, 3, and 4 all run in a fairly smooth curve, along which a continuous piece of lead will bend quite easily? Leave, then, that edge, and put in, first, the leads which divide No. 2 from No. 3, and No. 3 from No. 4. Now don't forget! the long lead has to come along the inside edges of all three; so the leaf of it will overlap those three edges nearly 1/8 of an inch (supposing you are using lead of 1/4 inch dimension). You must therefore cut the two little bits we are now busy upon 1/8 of an inch short of the top edge of the glass (fig. 54), for the inside leads only meet each other; it is only the outside lead that overlaps.
Fig. 54.
How the Loose Glass is held in its place while Leading.—This is done with