84 MONTHLY WEATHER REVIEW FEBRUARY, 1927
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SOLAR OBSERVATIONS
SOLAR AND SKY RADIATION MEASUREMENTS DURING at Washington and close to the normal amount at
Madison and Lincoln. No record was obtained a t Twin
Falls during February, as the pyrheliometer was under-
going repairs. The altitude of the pyrhelionieter a t that station is reported by the official in charge to be about 1,200 nleters instend of 1,300 as given in the January
REVIEW. No skylight-polarization observations were obtained a t Madison, Wis., as the ground was covered with snow
throughout the month. At Washington, measurements made on three days give a mean of 61 per cent with 8
nlaximum of 62 per cent on the 17th. These are close
to average values for Washington in February.
FEBRUARY, 1927
By HERBERT H. KIMBALL, Solar Radiation Investigations
For a description of instruments and exposures and an account, of the method of obtaining and reducing the
measurements, the reader is referred to the REVIEW for JanualY, 1924, 52 142, JanuaV, 1925, 53 :29, and July,
1925, 53:318. From Table 1 it is seen that solar radiation intensities averaged close to normal a t Washington, D. c., and Lin-
coln, Nebr., and slightly below normal at Mndison, Wis. Table 2 shows a deficiency in the total solar radiation
received on a horizontal surface from the sun and sky