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Popular Science Monthly 



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£ sheet iron j)lofe for 6''cL///nder 

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ii' sheet iron p/afe for 

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16 sheet /ron p/o^e for /2" cy/inder^'ho/es 

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£ sheet /ran p/ote for /o'cyt/nc/er 

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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 



