Turner, H. H. (Herbert Hall), 1861-1930 · London, E. Arnold · leaf 200
eed not concern us. What does concernUonf ^ ^s is, that if the needle is hung up and left longenough to come to rest, it does not then remainsteadily at rest, but executes slow and smalloscillations backwards and forwards, up and down. NUMBER OF SUNSP0T5 (_Wolf) eoyr^juxmd. (w^/rtl DAILY RANGE… … HORIZONTAL FORCE roc —«o— zo Plate XIL SCHWABE AND THE SUN-SPOT PERIOD 165 throughout the day; repeating nearly the sameoscillations on the following day, but at the sametime gradually changing its behaviour so as tooscillate diflerently in summer and winter. Thesechanges are very small, and would…
Astronomy
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