Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 78
n the position of the sun in his daily and yearly Chap. IV.] Terrestrial Magnetism. 59 course, are likely to be due to solar induction or to some lessdirect solar influence (such perhaps as changes of tempera-ture) j while some remarkable perturbations seem to be asso-ciated with outbursts taking… … Fig. 39. in steering his vessel is the declination, and in parts of theworld where it is well known the course is directed by thecompass alone in all weathers; astronomical observationsbeing used only to correct, from time to time, the calculatedposition, derived from the rate and magnetic bearing.…
Electricity
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