376 APPENDIX II 



again, stood the wind-vane and anemometer. At the end of 

 September the screen had to be moved a few yards to the east; the 

 snow had drifted about it until it was only 2| feet above the surface, 

 whereas it ought to stand at the height of a man. At the same 

 time the wind-vane was moved. The screen was constructed by 

 Lindstrom from his recollection of the old Fram screen. 



The two mercury barometers, the Fuess normal, and the Adie 

 standard barometer, reached Framheim in good condition; as has 

 been said, they were hung in the kitchen, and the four pocket 

 aneroids were hung by the side of them. All six were read at the 

 daily observations at 8 a.m., 2 p.m., and 8 p.m. The normal 

 barometer, the instructions for which were missing, was used as a 

 siphon barometer, both the mercury levels being read, and the 

 bottom screw being locked fast; the usual mode of reading it, on 

 the other hand, is to set the lower level at zero on the scale by 

 turning the bottom screw at every observation, whereupon the 

 upper level only is set and read. The Adie standard barometer 

 is so arranged that it is only necessary to read the summit of the 

 mercury. It appears that there is some difference between the 

 atmospheric pressure values of the two instruments, but this is chiefly 

 due to the difficult and extremely variable conditions of temperature. 

 There may be a difference of as much as five degrees (Centigrade) 

 between the thermometers of the two barometers, in spite of their 

 hanging side by side at about the same height from the floor. 

 On the other hand, the normal barometer is not suited to daily 

 observations, especially in the Polar regions, and the double 

 reading entails greater liability of error. That the Adie baro- 

 meter is rather less sensitive than the other is of small importance, 

 as the variations of atmospheric pressure at Framheim were not 

 very great. 



n the provisional working out, therefore, the readings of the 

 Adie barometer alone have been used; those of the normal 

 barometer, however, have been experimentally reduced for the 

 first and last months, April and January. The readings have 



