Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 132
een them. 137. Inclination or Dip.—Norman, an instrument-maker, discovered in. 1576 that a balanced needle,when magnetised, tends to dip downwards toward the north. He there-fore constructed aDipping -Needle,capable of turningin a vertical planeabout a horizontalaxis, with which hefound the… … Fig. 66. however, found thatj:he dip, Uke the declination, differsat different parts of the earths surface, and that italso undergoes changes from year to year. The dip in London for the year i88iwas67 39. At thenorth magnetic pole the needle dips straight down.•The following table gives…
Electricity · Magnetism
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