1915- No. 5- ROALD Amundsen's ANTARCTIC EXPEDITION : meteorology 71 



The corresponding numbers for the region round the North Pole are'. 



April May June July 



N-S 



± a°.6 

 - 3 -I 



± 2.°0 ± I°.0 

 — I.I — 0.7 



± o°.6 

 — 13 



4. The highest temperatures observed between Framheim 

 and the South Pole were. 



Sept. Oct. Nov. Dec. Jan. 



obs. ^ 28°.4 — i3°o — io°.3 ~ 14.7 — 4.8 



sea-level 



275 



— 12.6 



— 3-5 



The lowest temperatures observed. 



obs. — 54°.6 —34° 6 —33°- 1 — 28°.5 — 22°.6 



sea-level — 54.2 — 34 i — 329 — i3-7 — 20.3 



VI. The Pressure of the Air. 



To show the distribution of pressure along the track of the Expedition, 

 I have reduced the pressures observed at each station to sea-level from 

 the formula 



log b\ = log h\\ -(- --„ „_ i^„^ _, /i" 

 ft 1 » 11 I 67,25(273 H- t) 



(2) p. 



where // is the height of the station in metres, 



t the temperature of the air at the station reduced to half the height 

 above sea-level by adding o".53 per 100 m, 

 bii the pressure at the station, b^ the pressure at sea-level. 



The pressure at sea-level will be found in the Table on pp. 60 — 68. 

 Grouping the pressures at sea-level round each of the latitudes 79*^ to 

 90*^ in the same manner as the temperatures, we get the numbers in the 

 following Table. 



Pressure at Sea-level. 



1 L. c. p. 488. 



