Page:Popular Science Monthly Volume 90.djvu/486

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��Patterns for laying out and marking the drill holes for making the cylinders to hold the heating elements

��in. by 2 in. angles by which the cylinders are fastened to the base. (Fig. 8). These angles are made of sheet iron strips l/i6 in. thick and i in. wide. Cut twenty pieces of this size sheet iron strips 2% in. long and bend them as indicated in the drawing. A good way to do this is to clamp the piece in a vise so that 2 in. pro- trude above the grips, and pound this part over with a hammer until a right angle is formed. The two M-in. holes can then be drilled as indicated.

The next operation is to rivet the angles on the bottom of the cylinders. The angles are riveted on the inside of the cylinder the long side against the side of the cylinder.

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��Cylinder base clips

��The cylinders are now ready for winding. The method of winding is shown in Fig. 12. Wrap sheet asbestos 3^ in. thick around the cylinders and then start to wind at the bottom. Wind the turns about 3^ in. apart tightly against the asbestos covering. At the top make a similar fastening to the one at the bottom. To make the fastening per- manent solder the junction. No windings are placed on the i2-in. cylinder, as it is used to protect the windings on the other cylinders. One pound of No. 25 B. & S. gage bare copper wire will be required.

The next part to be made is the cover plate. A detail drawing is shown of it in Figure i. This plate is made of sheet iron.

After all parts are finished and the cylinders wound the parts are assembled. Place the 12-in. cylinder in position and rivet it to the base by means of /^-in, rivets, connecting the angles and the base. After this is in place fasten the lo-in. cylinder in the same way, then the 8-in., 6-in. and 4-in.

The next operation is the making of proper connections. The lower end of

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