Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 295
is subject to diurnal, annual andother periodic, as well as irregular, variations. 15. Inclination, or Dip, of the Magnetic Needle.Experiment 1. Magnetize a needle and suspend it by a silk fibre tiedaround it in such a position that it will rest horizontally. Bring the needle over the neutral line… … Fig. Til Experiment 2. Thrust a knitting-needle and a darning-needle at rightangles to each other through a small cork. Using the darning-needle as an axis, mount the needles as shown in Fig. 232,
Physics
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