NOTATION A\I> INTKKNATIONAI. NVKATHKI: SVMI 



ti. blue sky. 



c. clouds (detached), 

 o. overcast. 



g. gloomy, dull appearance. 



u. u gly> threatening appearance. 



v. visibility, unusually dear atmosphere. 



oo haze. 



m. sSs mist, light fog. 



f. SK fog. 



w. ^. dew. 



i > hoar frost. 



<- ice crystals. 



V silver thaw. 



~ glazed frost, 



p. passing showers. 



d. drizzling rain, 

 r. rain. 



s. -X- snow. 



4- snow drift. 



[S] snow lying (more than half the surround- 

 ing country covered with snow), 



h. A hail. 



A soft. hail. 



t. T thunder. 



1. ^ lightning. 



K thunderstorm. 



j* strong wind, 



q. squally. 



O solar corona. 



solar halo. 



IL) lunar corona. 



(D lunar halo. 



/N rainbow. 



W aurora. 



A bar ( ) under a letter indicates persistency, and a dot (.) intensity. The figure attached to a 

 symbol indicates very slight, whilst the figure 2 indicates strong or heavy : thus = slight rain, 

 % " = heavy rain. 



Column 12. Sunshine. The duration of sunshine is shown by the number of two-hour spaces covered 

 by the vertical black line within the column. The record was obtained by a Campbell-Stokes sunshine 

 recorder specially designed for use in high latitudes where the sun may be above the horizon throughout 

 the twenty-four hours. The instrument was placed on Hut Point, a conical mass of rock 50 feet high and 

 about 300 yards to the west of the ship (see map, p. 16). The base of the recorder was about 2 feet 

 above the ground. The only possible obstruction to the free horizon of the instrument was Crater Hill, 

 1,000 feet high and about 2 miles to the eastward, which may possibly have cut off some of the morning 

 sunshine in November and February. 



Columns 13 and 14. Clouds: Amount and Movement. The form, amount, and direction of movement 

 of the upper and lower clouds are given in these columns. As regards form, the classification and nomen- 

 clature adopted is that of the International Cloud Atlas. The amount is given by a scale of 11 points 

 (0 to 10) in which " 0" signifies a cloudless sky, and " 10 " a sky completely covered with cloud. The 

 direction of movement is that from which the cloud appeared to be travelling, and in common with all 

 the observations made at Winter Quarters, the bearings given are true and not magnetic. 



Column 15. Temperatures by Assmann's Aspirator. This apparatus was suspended from an iron arm 

 attached to one of the posts carrying the thermometer screens, and was 3 feet above the level of the snow. 

 The upper of the two readings taken at eacli observation is that of the dry bulb and the lower that of the 

 uri bulb. 



At the foot of the Columns. Maximum Temperature. Solar Radiation. Evaporation. Precipitation. 

 Observations of the maximum temperature were made twice daily, at 8 a.m. and S p.m., from a mercurial 

 maximum thermometer placed in the same srreen as the dry- and wet -bulb thermometers. 



B 2 



