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 



Popular Science Monthly 



Pattern 



6 

 5A7 



IE3456789 



Pattern 



Seam 



F19.G 



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. 



Table Leg Sliders Made of Shotgun 

 Shell Wads 



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. 



fa u cet /D ra i n 



bracket 



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. 



