Meteorological Observations on the Alabama Expedition. 29 
=~] 
The temperatures from September Ist 1909 to July 31st 1910 were 
all read on the station thermometers, placed in thermometer screen. 
All other observations of the temperature are made by means of sling 
thermometers. 
The thermometer screens were of a type used by the Danish Meteoro- 
logical Institute (a description is given in “Meteorologisk Aarbog” for 
1874) and they were hung on the mast from September Ist 1909 to March 
25th 1910, about 1,5 meter above deck. From March 26th to July 
31st 1910, the thermometer screens were hung оп the northwest side 
of the tent-house, about 1,5 meter above the earth. 
The maximum and minimum thermometers were somewhat out 
of order at the arrival in Shannon Island and proved to be rather uncer- 
tain. 
Table 3 contains the observations made by Captain MIKKELSEN 
in the interval from May 17th to September 15th 1910 while 
on the sledge expedition from Danmark’s Fjord along the outer 
coast to Skerfjorden. The readings on the barometer are taken 
on an aneroid barometer, No. 977, the temperature is found by 
means of sling thermometers and the velocity of the wind by 
help of the anemometer. | 
In Table 4 are found all observations from the sledge expedition 
on the inland ice. On March 24th the sledges were brought up 
on the inland ice, and the journey was made on a NNW course. 
On April 9th 1910 the two parties separated and Captain Mix- 
KELSEN continued on the NNW course across Kong Frederik 
den VIII Land to Danmark’s Fjord, which was reached on May 
13th 1910. Lieutenant Laub travelled towards the West to Dron- 
ning Louise’s Land and began the return-trip on May Ist, follo- 
wing about the same route as on the northbound journey. 
The pressure of the atmosphere was measured with pocket- 
aneroid barometers and the temperature was taken with sling thermo- 
meters. The force of the wind was estimated by Laus, while it was 
measured on a pocket-anemometer by MIKKELSEN on his journey from 
April 15th to May 13th. 
For determination of heights by means of barometer observations, 
Laplace has given a formula which can be changed to! 
Г (1+ 0.00367 в) 7 
(1+ 0.378; | 
(1+ a cos 2 y) (1 + 0.00239) 
| +R] 
Z (metres) = 18400 (log B, — log B) 
"8. P. Langley: Smithsonian Meteorological Tables, Washington, 1893. 
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