n, approxi- ina.tely 33 feet altogether. with shellac and allowed to dry, and the surface of the and the second section is proceeded with, and so on The wooden block, F, on which the magnet is formed spool on which the wire is wound should be covered until the twelve sections are wound. The coils… … ing the wire through and around the size of the iron wire is No. 18 American wire gauge. ring is to wind upon a small ordi The spool is 2,4; inches in diameter in the smaller part nary spool enough wire for a single Soy Si SS Sn es ow and 2 inches in length between the flanges. It is di- section,…
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