Smithsonian miscellaneous collections . (PUBLICATIOK 3402) GITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 16, 1936 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 19 CYCLES IN TREE-RING WIDTHS BYG. G. ABBOT Secretary, Smithsonian Institution. (Publication 34o: CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 16, 1936 ^^t £or5 (§aitim(ive {pvtee BALTIMORE, MD., C. S. A. CYCLES IN TREE-RING WIDTHS By C. G. abbot Secretary, Smithsonian Institution In my paper Solar Radiation and Weather Studies , I showedthat the variation of the suns emission of
Smithsonian miscellaneous collections . (PUBLICATIOK 3402) GITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 16, 1936 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 95. NUMBER 19 CYCLES IN TREE-RING WIDTHS BYG. G. ABBOT Secretary, Smithsonian Institution. (Publication 34o: CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION DECEMBER 16, 1936 ^^t £or5 (§aitim(ive {pvtee BALTIMORE, MD., C. S. A. CYCLES IN TREE-RING WIDTHS By C. G. abbot Secretary, Smithsonian Institution In my paper Solar Radiation and Weather Studies , I showedthat the variation of the suns emission of radiation since 1920 isthe summation of at least 12 periodicities ranging from 7 months to23 years in length. All of them are approximately, perhaps exactly,aliquot parts of 23 years. Hence, 23 years is a cycle wherein we mightexpect the weather and things dependent on it would show markedrecurring features. Furthermore, although hitherto mathematicalanalysis has not disclosed why the suns radiation should exhibit afundamental and many overtones like a violin string, yet since observa-tions show that it does so, it may well be that the fundamental isnot 23 years, but 46, 92, or some other multiple of 23 years. In my paper just cited I went on to show that all of
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