Turner, H. H. (Herbert Hall), 1861-1930 · London, E. Arnold · leaf 204
CRE^NWICH MACNETfC CURVES FOR APRIL IW-I86O SCHWABE AND THE SUN-SPOT PERIOD 167 manner very similar to that in which they changefrom month to month in any particular year, andthe law of change is such that in years when there ancibe- ^ tween are many sun-spots we get a large open curve sun-spot • 1…
Astronomy
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