on, approxi- mately 33 feet altogether. with shellac and allowed to dry, and the surface of the and the second section is proceeded with, and so on 1'he 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… … way of carry- ing the wire Figs. 7 & 8.-FORMING THE FIELD MAGNET. 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^ inches in diameter in the smaller part nary spool enough wire for a single S^\V^>^V and 2 inches in length…
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