Smithsonian miscellaneous collections . mperatures Fahr., 5-month running means. over the interval of 90 years, 1850 to 1939. It carries several integrallyrelated shorter periods on its back. The curves a and c represent theyears 1850 to 1899, and 1900 to 1939, respectively. Being similar, andin the same phase, their average, b, is used in what follows. With-drawing the average period of 452^-3 months, curve d from it the average period 45^-f-4 months, curve e re-sults. Withdrawing from it the average period 45^-^5 months, curve/ results. Withdrawing from it the average per
Smithsonian miscellaneous collections . mperatures Fahr., 5-month running means. over the interval of 90 years, 1850 to 1939. It carries several integrallyrelated shorter periods on its back. The curves a and c represent theyears 1850 to 1899, and 1900 to 1939, respectively. Being similar, andin the same phase, their average, b, is used in what follows. With-drawing the average period of 452^-3 months, curve d from it the average period 45^-f-4 months, curve e re-sults. Withdrawing from it the average period 45^-^5 months, curve/ results. Withdrawing from it the average period 45^-^-2 months,curve g results. The smooth heavy curve is the 45^-month periodfreed from all encumbrances. It has the amplitude 7 percent of normalprecipitation at Albany. Figures 20 and 21, relating to the periodicity of 11 j months inAlbany precipitation, will be understood from the description justgiven of figures 16 and 17. The heavy mean generalized curves, forsunspots sg 20 Wolf numbers, are similar in form and amplitude, but. Fig. 19.—The 452-month periodicity in Albany precipitation, cleared of over-riding periodicities, integral submultiples thereof. 3i 32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122 D D \ y —^ . \ / \\\\ // *—3 }-2 / x. \\ \ / & \\ //11 1 \ \ s. /I \/ v/ /// v AV \ c, -H > *. ^S. 1 / // / \\ % _\ / 1-~J B, ** / ,.-*\ s ._ N —^N. X * / * / /P / 5l, ^ i / \ >* X s / \ • > s \ N *// Sfc *l vs- v XV _/ /—* A> \/ X sS / **«*^—? \ s 4, \ s—-- —f—\1 \/ \ \ / / / y^ ^\ A \- Figs. 20 (left) and 21 (right).—Fig. 20, combination of six separate determinations ofthe iij-month periodicity into one general mean, for times when Wolf sunspot num-bers exceed 20. Fig. 21, same as figure 20 for Wolf sunspot numbers less than 20. Fullcurves are originals, dotted curves with phases shifted as per arrows. NO. 4 SOLAR VARIATION, WEATHER ELEMENT—ABBOT 33 differ in phase. Their amplitude is about 9 percent of normal precipi-tation at
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