Smithsonian miscellaneous collections . was discovered that a mere measurement ofthe brightness of the sky surrounding the sun could be made to yieldclosely enough the coefficients of atmospheric transmission at all wavelengths. This measurement is made with the instrument called thepyranometer. It thus becomes possible to make five solar-constantdeterminations in one morning and reduce them within the timeformerly occupied with one determination. The method as now de-veloped is explained in the Annals, volume 5, pages 110-120. 3. The Variation of the Suns Radiation Figure 4 shows superposed i
Smithsonian miscellaneous collections . was discovered that a mere measurement ofthe brightness of the sky surrounding the sun could be made to yieldclosely enough the coefficients of atmospheric transmission at all wavelengths. This measurement is made with the instrument called thepyranometer. It thus becomes possible to make five solar-constantdeterminations in one morning and reduce them within the timeformerly occupied with one determination. The method as now de-veloped is explained in the Annals, volume 5, pages 110-120. 3. The Variation of the Suns Radiation Figure 4 shows superposed in the form of lO-day means thesolar-constant results obtained at Montezuma, Table Mountain, andMount Brukkaros from 1925 to 1930. The order of excellence ofthe stations is the order just given. This is indeed plain from therelative smoothness of the three curves of figure 4. But though differ-ing in details, the three stations agree in showing in common certainprincipal trends, and thereby indicate a real variation of the sun. ij-v\Kr. NO. 10 SOLAR RADIATION AND WEATHER STUDIES ABBOT isa if\ i ^ ^ i. n i ^ Q Jo SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 X \, ^ \ V S., y ?^ ^- y / /^* ^ - .^- ^ \ V - ??- \l \ ^ .--? M^ s / ^-i \ ^ ?^ .,^^ ??- -.^ ^*> . - -!: ^ =*-« ^ c^ ^ ^^ ?^ 9^ R t. ^ r V Sz,-.^ ? , ^>^ „ ,, .-- / x: s ~- ?• (, XV ^ 7^ \, ^nJ */ ~\ ,^-— —^ i?-— ^ —? /?J ^ -. ^^ ^> i^SS** -> r^ A \^ \,^ =^ 1 ^ ^ ^ ^ ^ Si ^^ ^; ^ 1 1 —lill- ° \ ^ /^ * /// -? ?-sL ^.- i\ 1 ? SI ^ \ ^ ^ -^^ ° --.~ —^ N 0 =*^ ^ ~^^ ,- ^v. ^ ^ ?> cr_ * \A \ r ^- -- ^<^ / ° ^ s % s 1 I 1 NO. 10 SOLAR RADIATION AND WEATHER STUDIES ABBOT
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