610 



H. MOHN. METEOROLOGY. [norw. pol. exp. 



+ V 0162-0-052 = ± 0-15 mm. 



At the beginning of the sledge-journey in the middle of March, 1895, 

 Gary read 7 mm. lower than Hicks. The difference between the aneroids 

 had risen during the latter days of April to nearly 8 mm., and in the 3'^'^ 

 week of May to a httle above 8 mm. On the 29"^ May, Gary was found 

 to read only 2-8 mm. lower than Hicks, on the 30''' at 7 a. m. 2-1 mm. 

 lower, and on the same day at 7.30 p. m. Hicks was reading 20 mm. lower 

 than Gary. The difference increased on the 1^* June to 21 mm. and remained 

 during June between 20 and 26 mm. Hicks was carried in the pocket and 

 Gary in the kayak on the sledge. On the 30"^ May, Prof. Nansen remarks 

 "Hicks probably got a shock in my pocket." As seen from the above remarks, 

 Hicks must evidently have commenced to alter its correction on the 29'^ May. 

 Hicks was read simultaneously with Gary up to the 25*'^ June and only 8 

 times subsequently, in August, October, November, January and February. 

 The difference between the aneroids was then from 21 to 25 mm. In June 

 and July, 1896, at Gape Flora, Hicks was found reading 20 mm. lower than 

 Gary. 



With the probable corrections for Gary given below, we obtain for Hicks 

 the following corrections: June 1^*, -J- 27*0 mm.; June 8*'' , + 27'6 mm. ; June 

 gth^ + 30-9 mm.; June 14*1^, + 31-7 mm.; June 17'!^, + 32-2 mm.; August 8'i' 

 and lO'i', +29-7 mm.; October 31^t,+ 31-6 mm.; November SO*'', +33-3mm.; 

 January 1^'^, +33*0 mm. ; January 8"' , + 32'4 mm. ; and February 2'"i,+34-3 mm. 

 In June, 1896, at Cape Flora the correction was found to be + 31"0 mm. 



Up to the 27'^ May, 1895, only Hicks was read, with only a few excep- 

 tions, when both aneroids were read. After that date, the readings of Hicks 

 were not considered very trustworthy, and only the readings of Gary were 

 used for the determination of atmospheric pressure. 



When Prof. Nansen and his comrade had reached Mr. Jackson's Station 

 at Elmwood, Gape Flora, Franz Joseph's Land, the two aneroids were com- 

 pared there with the marine barometer Adie B. T. 655. The readings of 

 this barometer were reduced to standard temperature, and to the standard 

 barometer by means of the Kew-corrections given. The resulting readings in 

 inches were converted into miUimetres and reduced to standard gravity. The 

 result of 75 comparisons from June 20'^ to July 10'^, 1896, was, 



