# Page:Popular Science Monthly Volume 91.djvu/786

770

��ance must be made on the pattern for the locked seam on the seam edges and also for a lap seam where the two pieces of pipe meet at the joint line.

The oblong pipe, Fig. 2, is worked out in exactly the same way. The pattern for the

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��These elbows are used only in special places and for making an exhibit of the shop's work

oval pipe, Fig. 3, is developed by a combina- tion of two simple methods that may prove to be somewhat confusing unless carefully worked out. One of the methods is used in developing the pattern for the round elbow in connection with the one just described for the oblong elbow. As usual draw the front view A; next the bottom view B. Make the seam as indicated, number it I, then where the half-circle on the end begins, mark that point No. 2. Divide the half- circle into eight equal parts as indicated. Repeat this operation on the half-circle on the other end. Number all points con- secutively from I to 20. Transfer the distance between these points to the base line C-D. Project these points upward, then as usual project the points from the bottom view upward to the joint line on the front view and then over to the pattern until the line intersects with the similarly numbered line coming up from the base line. Make a cross at these points of inter- section and connect them with a free hand curve, which will give the complete pattern. Make allowance for seams and laps. The patterns for Fig. 4, 5 and 6 elbows are

��developed in exactly the same way. The steps are: (1) Draw elevation marked A.

(2) Draw the bottom view marked B.

(3) Space the bottom view. (4) Draw the base line C-D. (5) Transfer the spaces from the bottom view B to the base line C-D. (6) Project upward the points from the base line. (7) Project points from the bottom view B upward until they intersect with the similarly numbered lines coming up from the base lines C-D. (8) Make al- lowance for the locked seam and for the lap seam where the two pieces of pipe meet.

GOOD noiseless sliding casters or domes can be made for chairs and tables by taking some heavy felt or fiber shot- gun shell wads and securing one to the bottom of each chair or table leg, tacking through the side of it with carpet tacks, or small finishing nails. — H. K. Cappo.

��Blue Print Drying Rack to Hang Over Sink

A NEAT and inexpensive blue print drying rack can be made as follows: First obtain two pieces of wood i^ in- square by 30 in. long and drill holes in them 4 in. apart and large enough to admit a No.

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���A bracket for hold- ing wires from which blue prints may be suspended over a sink

��22-gage wire, as shown in Fig. 1. Two iron brackets fastened to the wall by wood screws hold the two pieces in place. The frame is now wired as indicated, and the ends of the wire fastened by staples as shown in Fig. 2. The clip, Fig. 3, is of spring phosphor bronze. Two of these are required for each wire for holding the prints. — Frank Harazim.

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