Fig. 72.
Fig. 73.
The rivet set is caught in a vise as shown in [Figure 70]. A rivet set is a piece of steel with the shape of a rivet head sunken into one end. In making this, a punch is filed the shape of a rivet head and is then driven into the end of a hot piece of steel. In [Figure 71] is shown a simple method of developing a pattern of one section for the top of a lantern. A-B of the pattern is first drawn. The length of X-B of the elevation is the length of C-D of the pattern. Lines are then drawn from C to A and B. The point of each section at the top is cut off so that when the four pieces are riveted to the angles there will be a ⁷⁄₁₆-in. hole thru the top. (See [Figure 72].) In this hole is put a piece of ⅛-in. steam pipe with a lock nut on the top and another on the bottom to hold it in place. (See [Figure 73].) The pipe is for the socket to screw onto under the top, and also for the wire to come thru. The loop at the top is to suspend the lantern by. It is made of ⅜ by ⅛-in. stock, 6 inches long. Two No. 10 rivets are put in each end to fasten it to the roof. The lamp is to hang by a chain suspended from the ceiling. In doing this a ceiling cap is necessary. This may be a piece of ½-in. steam pipe threaded on one end and a hook made on the other. (See drawing, [Figure 74].) A cast iron piece is screwed on the end of the pipe and is then fastened to the ceiling by three screws, which supports the chain and lamp. The wires go thru the pipe and connect with other wires in the ceiling. (See drawing of the casting, [Figure 75].) When the lamp is wired and the casting is fastened to the ceiling, it must be covered with something to hide the wires and its rough appearance. In [Figure 76] is shown a drawing for a cap to cover the casting and wiring. The cap has a hole in the center for the pipe to pass thru, leaving it movable on the pipe. A collar of cast iron, with a set screw in the side, is to go under the cap and the screw tightened when the cap is against the ceiling. (See drawing of the collar, [Figure 77].) In making the cap, it is heated and hammered over a hole in the swage block. A hammer with a large-sized, rounded face is used. The disk is driven into the hole until it becomes bowl-shaped and the right height.
Fig. 74. Fig. 75.
Fig. 76. Fig. 77.
Fig. 78.