Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 556
Fig. 418. some astronomical object, e.g.levelled by the spirit level B. The line passing in an easterly and westerly direction INTENSITY. 535 … Fig. 419. around the earth along which the lines of force (or needle)are horizontal, i.e. at whichthe dip is zero, is the magneticequator. It does not coincidewith the geographical equator.The lines roughly parallel tothe magnetic equator, alongwhich the dip is equal, arethe magnetic parallels.…
Physics
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