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Meteorological Observations on the Alabama Expedition. 
9 is here considered as mean of the temperature on the spot, $, and 
the corresponding temperature at the permanent station on Shannon 
Island, ty. 
For finding B,, we have the following material from the permanent 
station in Shannon Island; 1) readings on a mercury barometer at 8a, 
2p and 9p., 2) barograph-records from the aneroid barograph placed 
there, and the pressure of the atmosphere is consequently known at 
any moment within the 24 hours. 
As however the spots, whose elevation above sea level we are to 
figure out, are all to be found from 200 to 600 km NNW of Shannon 
Island, the values for B, in the vertical of the different spots will be 
somewhat different from the corresponding barometer-readings on Shannon 
Island. In order to examine this I have constructed isobarmaps, 
computed from observations taken at the permanent meteorological 
stations in Greenland, on Iceland and on Shannon Island for the hours 
За, 2p and Эр, and I have endeavoured to extend the isobars to the 
localities of which the elevation shall be ascertained. 
In some cases the isobars can be drawn with a comparatively 
great certainty, while in other cases it is not possible even to judge 
the direction of the gradient or its value, wherefore in these cases, 
I have been compelled to use the barometer-readings from Shannon 
Island. 
The barometer-reading on the height-stations under debate is of 
course also somewhat uncertain, as the readings have all been made 
оп ап aneroid barometer. As is well known, these barometers are not so 
accurate as mercurial barometers, particularly when there is some disturb- 
ance in the air. 
The uncertainty in the calculated elevations is largely owing to 
the uncertainty in B, and В, while the error in @ in comparison with the 
above is quite insignificant. 
The results from the stations where observations have been made 
for several days indicate, however, that the difference between the 
different height-observations on the same spot rarely exceeds 30—40 
metres. 
In Table 4 are found the observed barometer-readings and tem- 
peratures, as well as the values for B, and 6, used for computing the 
calculations for the elevation according to the formula found above. 
Table 5 contains monthly summaries of observations from Shannon 
Island and Bass Rock, covering the interval between September 1909 
and July 1912. 
The mean pressure of the atmosphere, the mean force of the 
wind, and the mean amount of cloud are without correction calculated 
as mean of the daily observations. The value for the amount of cloud, 
