308 |». Appendix. 
was destroyed on the night of the 18th May, when it was impossible 
to estimate the velocity of the wind. The anemometers used were 
tested at the Kew Observatory prior to the departure of the Expedi- 
tion from England, and were found to give results within 97% of the 
Kew instruments. It is evident, however, that the action of wear 
and tear on the instrument by these: gales must have a very material 
influence on its indications. It would be advisable on future 
Antarctic expeditions to take pressure anemometers of the type 
Cator and Lind besides the Robinson pattern. : 
The mean barometric pressure for the winter months is much 
lower than the mean for the summer, but the means have not yet 
been determined, as there are some 4,000 observations to be dealt 
with. The highest barometric pressure occurred on July 22nd, 1899, 
when the barometer registered 30°182 inches, and the lowest— 
27'860 inches—on September oth, 1899. Both of these readings 
are reduced to freezing-point only, and are not corrected for gravity. 
Another important feature in the meteorological conditions is the 
very small amount of snowfall at the sea-level. A snow gauge was 
erected at some distance from the hut, and during the whole year it 
collected no more than 3 inches rain equivalent. The heaviest 
snowfall at one time occurred on April 5th, 1899, when the gauge 
collected o*19 inches; the depth of the snow on a level being 
8 inches and exceedingly light. : 
TABLE IX.—THE NUMBER OF HOURS OF BRIGHT SUNSHINE RECORDED 
BY THE CAMPBELL-STOKES INSTRUMENT. 
Month. No. of Hours. Remarks. 
Marc = UIT 
Apal 202 f MEDIE 
NEDA PM 8 Sun left rsth, too weak to burn on few days prior 
to departure. 
du. 6 Mos 2 Sun below horizon. 
August . . . 27 Sun too weak to burn for some days after its 
return. 
September s 5 57 
October. . . 185 From 6 A.M. to 9 P.M. Not recorded when sun 
November . . 216 bd h | 
DU Gee was below the pole. 
January 5 5 5 3 
Total 703 
For high latitudes the Campbell-Stokes sunshine recorder should 
be constructed so as to burn when the sun is below the pole without 
any difficult readjustment of the instrument. 
ET ST RISE TETE ERE з 
