THE METEOROLOGY OF GLEN NEVIS 



663 



Table VIII. — continued. 

 Observations taken on Wth February 1902, during an Ascent of Ben Nevis. 









Tempera- 

 ture. 









Temperature. 



Hour. 



Locality. 



Height. 



Wind. 



Force. 



Cloud. 























Ben Nevis. 



Fort- 

 William. 



Achariaeli. 







Feet. 

















11 



South side of Ben Nevis 



328 



25-5 



Calm 







2 



8-1 



25-0 



22-5 



11.30 



>> >> 



879 



27-0 



N 







1 







21-3 



12 



Near Second Bridge 



806 



290 



Calm 







2 



9-1 



27-0 



190 



12.30 



Big Bridge . 



1209 



26'9 



Calm 







7 



... 





23-0 



13 



The Lake 



1852 



21-9 



NE 



0-1 



7 



9-9 



28-2 



27-8 



13.30 



Half-way Hut 



2190 



21-0 



NE 



0-1 



3 







28-0 



14 



End of Long Stretch 



2719 



19-9 



N 



0-2 



3 



9-8 



28-8 



29-2 



14.30 



Near Chrystal Well 



3414 



15-8 



NNE 



1-2 



3 







26-3 



15 



Under Plateau 



3838 



12-5 



NNE 



2 



4 



10-2 



310 



243 



15.30 



Summit 



4406 



102 



NE 



1-3 



4 







24-2 



16 



»j ... 



4406 



10-3 



NE 



1-3 



10 



103 



31-4 



24-2 



17 



Ahove Long Stretch 



3183 



17-3 



NNE 



1 



10 



11-1 



30-5 



221 



17.30 



Half-way Hut 



2190 



199 



NE 



0-1 



3 



11-3 





22T 



17.43 



The Lake . 



1825 



20-4 



Calm 







2 



(11-4) 





22-1 



18 



Big Bridge . 



1202 



24-0 



Calm 







2 



11-5 



27-0 



220 



Explanation of Tables. 



Howly Values (Table IX.). 



Barograph. — The barograph readings were measured off the curves at each hour, 

 the values being controlled by eye observations of the standard mercurial barometer. 

 As the tabulated values were entered only to the y^tus of an inch, the means at some 

 hours differ slightly from those of the control observations, which were measured to 

 the 10 1 00 ths of an inch. 



Thermograph. — The hourly thermograph values were controlled by the eye 

 observations taken several times daily. These eye observations were all entered on 

 the sheets, and the thermograph reading corrected so as to agree with the eye observa- 

 tions. When there was a change in the difference of the two instruments between 

 the last eye reading at night (9 p.m.) and the first eye reading in the morning (9 a.m.), 

 a progressive change has been assumed, and the thermograph readings corrected 

 accordingly. 



Hygrograph. — The hourly relative humidity values shown by the Richard hygro- 

 graph have been controlled by the humidity deduced from the dry and wet bulb 

 thermometers. The mean correction was found to be less than + 2 per cent. , the 

 hygrograph showing the lower value, and this correction was fairly constant ; indeed, 

 the mean monthly corrections vary between +2*3 per cent, and +1*6 per cent. Owing 

 to the very rapid changes in relative humidity shown from an inspection of the automatic 

 records, careful timing was necessary, and the clock error of the hygrograph was noted 



