The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 65
d area; declination may have at- 48 DYNAMIC ELECTRICITY AND MAGNETISM. tained its maximum or minimum at a remote point eastor west of any isogonic line, and tlie opposite phase setin long before the same change occurs at intermediatepoints; so that it may be increasing or diminishing inopposite… … FTom U. S. Coast andGeodetic Survey. Fig. 21. continent from east to west since observation began,and that its return eastward is now setting in. Eastelongation had attained its stationary phase, followedby reversal, at Halifax, N. S.,in 1713, at Eastport, Me., in1749, at Boston in 1780, at New…
Electricity · Magnetism
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