Abstract
WE have received the meteorological observations made at the Hamburg Astronomical Observatory for 1910โ12. This institution was established in the town of Hamburg in 1825, and was for many years under the able superintendence of Dr. Riimker; it is now situated at Bergedorf, 19 km, E.S.E. of its former position, and is under the superintendence of Dr. Schorr. Very complete and careful observations are made five times daily; the amount of cloud is also given for each hour between 6h. p.m. and 6h. a.m. The sunshine is recorded by Campbell-Stokes (burning) and Jordan (photographic) instruments. The average annual difference in the possible percentage for 1910โ12 is 6ยท7 in favour of the Jordan recorder. Although the observations are not strictly comparable, we should not have expected so much difference. An interesting comparison of temperature and humidity in English and French screens is made with the readings of an Assmann's aspiration psychrometer. The hourly means of temperature in both screens are generally higher than those of the psychrometer; the greatest differences occur in daytime, especially in the French screen (open at bottom), but at the gh. p.m. observation the reverse obtains. Humidity in the screens is generally higher than the readings of the psychrometer, especially during summer.
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Meteorological Reports . Nature 91, 675 (1913). https://doi.org/10.1038/091675a0
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DOI: https://doi.org/10.1038/091675a0