326 INDEX. 



Temperature, vertical distribution : 41 ; convexioD currents and, 43 ; see also ' Upper air 



observations.' 

 ' Terra Nova,' voyages of, 10. 



Thermograph : in the Hut, 15, 16 ; in the screen, 15, 16. 

 Thermograph records : method of reducing, 17. 

 Thermometers : comparison of, 17 ; sledging, 17 ; in use at Cape Evans, 16, 17 ; minimum used 



on sledging journeys, 19, 20. 

 Time : used at the stations, 10. 



u 



Units, vii. 



Upper air observations : chapter VIII, 270 ; winter ascents, 273 ; summer ascents, 277. 

 Upper atmosphere, motion of : at Cape Adaie, 133, 139 ; at Cape Evans, 131 ; at Hut Point, 

 139 ; over Antarctic at approximately 3,000 metres, 264 ; during blizzards, 136. 



V 



Variation, daily : definition of, 52. 



Vertical distribution of temperature : 41. 



Volume II : description of the maps in, 211 ; description of the plates in, 210. 



w 



Walker, G. T., viii. 



Weather: associated with calms, northerly winds and southerly winds, 11 ; at Cape Adare, 13; 



at Cape Evans, 11 ; at Framheim, 13 ; pressure distribution and, 238. 

 Weather maps : method of construction, 211. 



Wilson, C. T. R. : potential gi-adient on Scott's first expedition, 314. 

 Wilson, E. A.: journey to Cape Crozier, 8, 21, 22, 24; Tranquil Bay, 111. 

 Wind : chajrter III, 94 ; Cape Adare, 128 ; cloud and, 151 ; cold surface layers of air and, 125 ; 



comparison of simultaneous winds at Cape Evans and Framheim, 232 ; gustiness, see ' gusti- 



ness ' ; instruments and methods, 94; structure of, 115; sudden breaks in velocity of, 127; 



sudden commencements of, 128 ; at various heights over Cape Evans, 138 ; pressure changes 



and, 236 ; pressure differences and, 236 ; temperature and, 44, 83. 

 Wind direction : 107 ; during blizzards, 108 ; northerly and southerly groups, 113. 

 Winds, plateau : 141-146. 

 Wind steadiness : definition of, 108. 



Wind vane : in use at Cape Evans, 95 ; self-recording at Corner Camp, 112. 

 Wind velocity : annual variation of, 97 ; annual variation of high winds and calms, 99 ; cold 



surface layers of air and, 100 ; daily variation of, 100 ; daily variation cf calms and, 103 ; 



daily variation of, and convesion currents, 100 ; frequency of, 103 ; highest recorded, 97 ; 



mean monthly values of, 96. 

 Wright, C. S. : vi ; observations made by, 9 ; took charge of meteorological work, 8. 



Y 



Yarmouth : frequency of winds at, 103. 



