File:Smithsonian miscellaneous collections (1955) (14775137251).jpg

Identifier: smithsonianmisce1211955smit (find matches)
Title: Smithsonian miscellaneous collections
Year: 1862 (1860s)
Authors: Smithsonian Institution
Subjects: Science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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fW/i A /k /i \^ /v \/^ \ t VVM (M^ yu ij\\) \V v^ V / 4m \ A/^ ^^y \1 / 1 >Y/^ \ v^ Ah ff V \Vf ^W gV^ fv/ Vv \a/^ Hi \/- wvj 1 V V V v\y \/ v/ \/vj V— w w\/ r vr ^^ \- J Y m/ ^ V w V « ficriirp C flip liPQ-i^^r full rnrvp rpnrpQpntS tllC obsCrVCd In figure 4 the heavy curve shows the smoothed percentages of normalprecipitation, 1916 to 1939. The lighter curve gives the synthesis of theeffects of 22 regular periodic variations of solar radiation, which in-fluence the precipitation at Albany. All these periods are approxi-
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13 14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 mately aliquot parts of 22; years. The actual lengths of periods usedin the synthesis are as follows, as expressed in months: 4h 5i 6-1/15, 7, 81-, gl gj, lof, iii, 13-1/10, 13I, isi 22f, 24!, 30J, 34i,38i 4Si 54i, 68i.Later added, lo-i/io and i8i. It is obvious that the synthetic curve of figure 4 follows the ob-served curve in its general form, and with few departures of phase.Slight phase differences occur for certain features of the years 1920,1923-24, 1927, 1929, and 1937. The amplitudes of vertical wander-ings of the synthetic and observed curves are practically identical. Omitting the intervals July 1923 to November 1924, January toJuly, 1927, April 1937 to March 1938, when obvious changes ofphase occurred, the average discrepancy between synthesis and eventfor 259 months is 14.9 percent. However, in the first 5^ years, fromJanuary 1916 to February 1921, the average discrepancy is but 12.0percent for 62 months. Several other

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