Smithsonian miscellaneous collections . eusually occurs at each ii| years, though not invariably. One typeholds for instance through the two periods of ii| years each fromOctober 1841 to June 1864. But then, note the abrupt transitionbetween the 42 months preceding and the 42 months following July1864. The mean of the first pair of lines is almost precisely oppositeto the mean of the last pair, as is shown in figure 17 and table 9. Of the 10 curves illustrating the 21-month periodicity, numbers i,3, 4, 6, 8, and 9, beginning 1819, 1841, 1852, 1875, 1897, and 1910,respectively, are generally si
Smithsonian miscellaneous collections . eusually occurs at each ii| years, though not invariably. One typeholds for instance through the two periods of ii| years each fromOctober 1841 to June 1864. But then, note the abrupt transitionbetween the 42 months preceding and the 42 months following July1864. The mean of the first pair of lines is almost precisely oppositeto the mean of the last pair, as is shown in figure 17 and table 9. Of the 10 curves illustrating the 21-month periodicity, numbers i,3, 4, 6, 8, and 9, beginning 1819, 1841, 1852, 1875, 1897, and 1910,respectively, are generally similar in phase, and not greatly differentin amplitude. Opposed in phase are curves 2, 5, 7, and 10, but they arenot quite so similar each to each. From this we see that during about70 years out of no, the 21-month periodicity, whether we regard itas true or spurious, would have produced nearly identical effects uponthe temperature of Berlin. The general mean effect over 70 years, as NO. 10 SOLAR RADIATION AND WEATHER STUDIESâABBOT 39. Fig. 17.âDetails of the 11- and 21-month periodicities in Berlin tempera-tures. Showing abrupt reversal of phase. 40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 f T ^T 0 ^ y r ^T 0 roo2 ^. -^ ]⢠d 0 0 =0. ^1 0 ./> 0 0) ^ 2 ^ ^ 0 ^ r; 5^ ^ 0 m t^ « VO -? - 0 â¢^ i? » 1^ I T T I O T Wo ⢠NO. 10 SOLAR RADIATION AND WEATHER STUDIES ABBOT 4I computed from curves i, 3, 4, 6, 8 and 9, is as follows and is illustratedat A of figure 16. The mean values which follow are expressed asusual in units of o.°i Centigrade/ 2-3 2-8 5-4 5-2 â â â â â The range of the general mean is o.°8 Centigrade. This mean curverepresents the tabulation of 39 lines in each of its 21 columns or 819months in all. The contradictory results found in the remaining 24lines, representing 504 months, themselves somewhat approach acommon type. Its mean form, shown at B of figure 16 is as follows
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