8 H. MOHN. METEOROLOGY. [norw. POL. exp. 



After the voyage, 86 observations at the Institute gave 



Att. Therm. Corr. Obs. 



— 2-7° + 0105 mm. 21 



20 4- 09 31 



18-8 —0-19 28 



25-6 — 0-19 6 



This gives, 



for 1893, Corr. = - 0015 — 0-031 {t° — 9 25°) = + 0271 — 0-031 . t 

 „ 1897, „ = - 0-018 — 0-017 (^ — 9-3°) = + 0140 — 0-017 . t 

 Giving double weight for 1897, we get 



Mean Corr. = + O'lS - 0-022 . t mm., 

 which I have adopted. 



In the same manner as with Adie 763, I have deduced the influence of 

 pressure upon the correction. 



t b Corr. 



— 3-7° 771-7 mm. + 0-06 mm. 



— 3-0 743-1 + 0-10 

 18-1 768-1 - 0-08 

 18-5 741-5 — 0-03 



Corr. (1897) = + 0140 — 0-017 t + 0-0007 (760 - 6). mm. 

 6 = 730 ; 0-0007 (760 — 6) = + 0-02 mm. 

 6 = 780 0-0007 (760 - b) = — 0-01 mm. 

 On board ship, Adie 763 and Adie 764 were compared from February, 

 1895, to June, 1896. 



No. 764— No. 763 Temperature 

 1st Half-year, 1895 0-26 mm. 164° 



2nd — 1895 0-27 16-2 



1st — 1896 0-22 15-9 



Mean 0-25 mm. 16-2° 



The adopted corrections are, at 16-2°, 



For Adie 763 Corr. = + 0-12 mm. 

 „ 764 „ — 0-17 mm. 

 Difference 0-29 mm. 



Diff. observed on board 0*25 mm. 

 Difference 0-04 mm. 



