994 | H. Hansen. 
ging to the Meteorological Institute were made whenever possible on 
the sea voyage to Shannon Island, and while in the ports at Thors- 
havn, Reykjavik and Angmagsalik. 
After the arrival at Shannon Island repeated comparisons were 
made between the mercury barometer and the aneroid barometers during 
the whole stay in Greenland in the years 1909—12. After the return 
to Copenhagen in 1912, the mercury barometer and the aneroid baro- 
meter No. 977 were again compared with the Normalbarometer be- 
longing to the Danish Meteorological Institute, and the mercury baro- 
meter (Adie No. C. 553) had not changed its error in the interval. 
Observers. 
Messrs. Ejnar MIKKELSEN, У. Laus and H.C. JØRGENSEN acted 
as observers through the whole time, as well at the winterquarters, 
as on the different sledge expeditions. 
Observations. 
All hours of Observations are given in local time. 
The pressure of the atmosphere is reduced to 0°C., to sea 
level and to gravity at 45° lat. The gravity correction for latitude, C,, 
is figured out according to the formula: 
h—h,, = h x 0,00259 cos 2 g, 
which for ф = 75° 17’ 43” north. lat. (Shannon Island’s North-east 
point). 
gives C, = + 1.65 mm at 731.38 mm. 
and С, = + 1.75 mm at 775.71 mm. 
The temperature of the air is always taken on mercury ther- 
mometers, and temperatures below — 34°C. are therefore uncertain. 
The direction of the wind is given true. All observations on 
the sea voyage, during which the direction of the wind is given magnetic, 
are later on corrected for the deviation. In the tables are used the 
following abbreviations, viz: 
N = North 
В — Bast 
5) — south 
W = West 
The force of the wind is as a rule estimated and tabled ac- 
cording to the 12-divided scale (Beaufort’s scale). On the sledge 
expedition made across the inland ice by Captain MIKKELSEN, and 
later on along the sea-coast from Danmark’s Fjorden to Skærfjorden, 
the velocity of the wind is measured with a pocket-anemometer 
and tabled in metres pr. second. 
