Annals of the Astronomical Observatory of Harvard College Volume 73
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...N. Height Op Babometeb Above Mean Tide, 195.1 Metres Or 640 Feet. N. B.--This and the following tables are in the form recommended by the International Meteorological Congress of Vienna in 1873, with modifications subsequently adopted. Maximum and minimum values are denoted by heavy-faced type, except for relative humidity in which only the minima are so indicated. The barometer is corrected to 273a, 32 F., but is not reduced to sea level nor to standard gravity. Maximum and minimum temperatures are for the preceding 24 hours. The normal vapor pressure is for the years since 1891. In the cloudiness column the occurrence, at the hour of observation, of rain, is indicated by, snow or sleet by, fog by--below the amount of cloud. Wind velocities, which are true velocities and are expressed in metres per second, are for the five minutes preceding the hour named. Precipitation is the amount during the preceding 24 hours. Absence of precipitation is denoted by a dot (.), and amounts less than 0.25 millimetre, or.01 inch, are recorded T. The international symbols used in the Remarks, and in Table II, are: --% Rain. V Frostwork (Rough) forming. T Distant Thunder. Snow. cO lee Coating (Smooth) forming. OO Haze..A. Hail 4 Drifting Snow. (r) Solar Halo. / Sleet. a--Floating Ice-Crystals. (J) Solar Corona. Fog. _jwi Gale. q? Lunar Halo. _ X Dew. "5, Thunder Storm. x/ Lunar Corona, i i Hoar Frost. J Distant Lightning. / Rainbow. gj Surrounding country more than half under snow..." Aurora. The intensity of a phenomenon is denoted by an exponent; 0 indicating slight; 2, great, and an absence of exponent, moderate intensity. In the Remarks the time of occurrence is expressed in hours and tenths; morning and afternoon are indicated.
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- 13 Sep 2013
- Illustrations, black and white