Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 144
ting-needle and notice the dip. {c) A magnetized sewing-needle, suspended near its middle(at its centre of gravity) by a finethread or hair or an untwistedfibre will serve as a dipping needie.It should first be suspended so as to hang +horizontal and magnetized afterward.A simple form of dipping… … Fig. 220.
Electricity · Magnetism
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