THE METEOROLOGY OF GLEN NEVIS 



635 



mean sea-level) was of the Fortin pattern, and had a Kew certificate, a further check 

 being obtained by comparisons made of its readings with those of the standard of the 

 Fort- William Observatory both before and after these observations. For use in 

 excursions there were two aneroids (one of the Watkin pattern) and a sling thermo- 

 meter. There was a pocket spectroscope for rain-band observations. The time of the 

 station was provided by a ship's chronometer, which was frequently compared with the 

 standard time at the Fort- William Post Office. 



On 26th October a new rain-gauge was set up near the head of Glen Nevis, about 

 30 yards S.E. of Allt Coire Eoghainn, a burn which reaches the valley just at the end 

 of the Glen Nevis carriage drive. This gauge was at a height of 357 feet above the 

 sea, about 1^ miles east of Achariach. The gauge was as a rule read once 

 a week, and always on the 1st of each month, so that the results would be directly 

 comparable with those of the other gauges at Achariach, Ben Nevis, and Fort- William. 



Hours of Observation. 



The regular hours of observation were 9 a.m., 10 a.m., noon, 2 p.m., 4 p.m., and 

 9 p.m. ; but, owing to frequent absence from the station on excursions, only the early 

 morning and late evening observations are complete for the whole period. The follow- 

 ing table shows the number of days in each month on which observations were made 

 at the different hours : — 





October. 



November. 



December. 



January. 



February. 



Total. 



9 A.M. 



10 „ 



Noon . 



2 P.M. 



6 



9 „• 



Other hours 







29 

 29 

 19 

 24 

 17 

 4 

 29 

 16 



30 

 30 

 12 

 27 

 21 

 12 

 30 

 14 



31 

 31 

 16 

 24 

 16 

 16 

 31 

 19 



31 

 31 

 11 

 20 

 12 

 26 

 31 

 27 



28 

 26 

 10 

 19 

 5 

 23 

 28 

 41 



149 



147 



68 



114 



71 



81 



149 



117 



Tc 



tal 





167 



176 



184 



189 



180 



896 



In the tables appended, the values are those for 9 a.m., 10 a.m., 2 p.m., and 9 p.m. 

 (see p. 668), and in additional tables (see p. 680) the data referring to other hours 

 are given in a different form. Particulars as to methods of reduction, hours at which 

 rainfall was read, and other information are given on p. 663. In the tables the hours 

 are reckoned from 1 to 24, the latter being midnight. 



Discussion of the Observations. 



In the discussion of the observations the main point kept in view has been to 

 utilise the Ben Nevis and Fort- William data so as to throw light on the abnormal 



