Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 57
alf min-ute, when near the poleof a magnet, then (72 — 42)equals (49—16) equals 33,so that 33 represents thelength of the line to bedrawn to any convenientscale at this position ofthe needle. The follow-ing table records the dataof a needle oscillating test, and Fig. 50 illustrates the plotting of… … So Fig. 50.—Testing Magnetic Distributionby tbe Needle. Table I.—Oscillation Test. Oscillations. Oscillationssquared. Oscillaiions squaredminus Earths Oscilla-tions squared. Relative Quantitiesof Free Magnetism. At centre 4 5 6 7 8 9 At pole 10 9.8 16253649648110096 16 — 1625 — 1636 — 1649 — 1664 —…
Electricity · Magnetism
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