File:Smithsonian miscellaneous collections (1955) (14780164711).jpg

Identifier: smithsonianmisce1221955smit (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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JnrJC — /-y? «r ^c //■•jj?j * Fig. 2.—Photographic copy of Froilands original reading of thesilver-disk pyrheliometer. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 122, NO. 5, PL. 1
Text Appearing After Image:
Standard Water-flow pyrheliometer as mounted atTable Mountain, Calif. NO. 5 SILVER-DISK PYRHELIOMETRY—HOOVER AND FROILAND J Figure 2 is a photographic copy of A. G. Froilands original read-ings of the silver-disk pyrheliometer S.I. 5ws on September 29, 1952. A summary of all the comparisons between S.I. 5ms and standardwater-flow No. 5 is given below: 1. of values Date Mean constant S.I. 5. 37 1932 •3625 42 1934 .3629 18 1947 .3626 100 1952 .3622 The variations in the above results are probably within the limitof error of the observations; thus we may assume the constant ofS.I. 5bis has remained constant since 1932. The constant of S.I. 5ms, as detemined by 32 comparisons with thestandard silver-disk pyrheliometer A.P.O. 8biS in 1931 and 1932, was0.3718. The mean of 64 comparisons with A.P.O. 8Di8 just beforeS.I. 5t>is was carried to Table Mountain, Calif., and 64 comparisonsjust after its return to Washington gave exactly the same constant.The mean of all good comparisons betw

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