[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 170
spensed with, and the line bat-teries connect directly with the sounders. Should the reader wish to construct an experi-mental instrument, he may do so by working outthe following directions. The cores of the magnets are to be made of |inch round wrought iron—Norway iron preferable,on account of… … RECENT APPLICATIONS. 169 I inch in external diameter and \ inch thick; theymust fit tightly. Insulate the cores between thewashers and bore a ^ inch hole in one washer oneach spool to take out the beginning wire andthen put the spools in a lathe and wind them fullof No. 24 insulated wire. It is…
Electricity
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