INTER-RELATIONS OF BAROMETRIC PRESSURE. 



509 



above the height of 2000 feet only, whereas from this height down to sea-level it was 

 under the pressure of air, the humidity of which being very large, its density or pressure 

 was therefore correspondingly reduced. It thus followed that the sea-level pressure at 

 Fort- William was lower than it would have been if the dry dense air of the anticyclone 

 had been continued down to Fort- William. On the mean of the day the sea-level 

 pressure for Fort- William was 30-199 inches, but for the top 30*246 inches, or an 

 excess for the top of 0'047 inch. 



At Fort- William there were 8*62 hours' sunshine, and on the top lO'll hours', whilst 

 at both Observatories there was no cloud and the rainfall nil. 



Cases where the temperature at the top of Ben Nevis is higher than at Fort- 

 William are of not infrequent occurrence. The most notable of these occurrences took 

 place on 19th February 1895, when, at 9 a.m., the temperature at Fort- William was 

 16°*0 and on the top of Ben Nevis 33° - 6, the temperature at the top being thus 17°'6 

 higher than at Fort- William. The following are the observations from hour to hour of 

 this remarkable day : — 



Hourly Observations at the tivo Observatories on 19th February 1895, when the Temperature of the top much exceeded the 

 Temperature at Fort- William. The Barometric Differences are given in thousandths of an inch. 





Barometer, at 32° and 











Hygrometer 









Wind 





Sea Level 







Temperature. 





Depression of 



Sunshine. 



Rain. 



— 12. 

















Wet Bnlbs. 











Fort- 



Ben 



Differ- 



Fort 



Ben 



Mean. 



Differ- 



Fort- 



Ben 



Fort- 



Ben 



Fort- 



Ben 



Ben. 





William. 



Nevis. 



ence. 



William. 



Nevis. 



ence. 



William. 



Nevis. 



William. 



Nevis. 



William. 



Nevis. 



Nevis. 





Ins. 



Ins. 



Ins. 















Hrs. 



Hrs. 



Ins. 



Ins. 



Dir'n.Force. 



1 A.M. 



30-400 



30-443 



+ 43 



20°6 



30°-8 



25°7 



+ id-2 



2° 4 



10°0 











NE 1-0 



2 ., 



•401 



■455 



+ 54 



18-8 



297 



24-2 



+ 10 9 



1-3 



8-8 











Calm 



3 „ 



'398 



•459 



+ 61 



17-3 



29-4 



23-4 



+ 121 



1-3 



8-2 











Calm 



4 ,. 



•396 



•458 



+ 62 



15-3 



31-0 



23-1 



+ 157 



0-4 



9-8 











ENE 



5 ,, 



•390 



•456 



+ 66 



16-0 



30-0 



23-0 



+ 14-0 



9 



8-6 



... 









Calm 



6 ,, 



•394 



•445 



+ 51 



17-9 



30-9 



24-4 



+ 13 



1-2 



9-2 











ENE 1-0 



7 „ 



30-396 



30-454 



+ 58 



16-9 



30-3 



23-6 



+ 13-4 



1-4 



8-7 











ENE 1-0 



8 ,, 



•404 



•459 



+ 55 



16-3 



31-5 



23 9 



+ 15 2 



1-3 



9-0 



"o 



V 50 







Calm 



9 ,, 



•410 



•457 



+ 47 



16-0 



33-6 



24-8 



+ 17 6 



1-5 



10-2 







1-00 







Calm 



10 „ 



•409 



•444 



+ 35 



189 



34-9 



26-9 



+ 160 



2-0 



9-5 



•92 



1-00 







ENE 



11 ,, 



•420 



•427 



+ 7 



24-2 



36-0 



30-1 



+ 11-8 



2-4 



9-6 



1-00 



1-00 







Calm 



Noon 



•410 



•404 



— 6 



27-0 



37-0 



32-0 



+ 10 



3-0 



11-5 



1-00 



1-00 







Calm 



1 P.M. 



30.396 



30-397 



+ 1 



30-2 



34-6 



32'4 



+ 4-4 



3-8 



9-4 



1-00 



roo 







Calm 



2 „ 



•391 



•370 



— 21 



32-9 



38-5 



35-7 



+ 5-6 



4-4 



11-2 



1-00 



1-00 







Calm 



3 „ 



•380 



•368 



— 12 



35-0 



35-1 



35-0 



+ 01 



5-3 



10-3 



1-00 



1-00 







NW 



4 ,, 



•382 



•371 



— 11 



35 



33-2 



34-1 



— 1-8 



4-0 



9-2 



1-00 



1-00 







NNW1-0 



5 ,, 



•388 



•390 



+ 2 



33-0 



32-3 



32-7 



— 0-7 



4-8 



9 5 



•58 



1-00 







N 1-0 



6 „ 



•401 



•419 



+ 18 



293 



30-1 



29-7 



+ 08 



2-4 



91 











N 1- 



7 „ 



30-409 



30-433 



+ 24 



26-9 



30-6 



287 



+ 37 



2-9 



9'6 











NNWT 



8 „ 



•412 



•438 



+ 26 



24-1 



31-0 



27-5 



+ 69 



2-0 



9-4 











NNW1- 



9 ., 



•416 



•448 



+ 32 



22-0 



301 



26-0 



+ 81 



1-4 



9-6 





*•• 







NNW2- 



10 „ 



•418 



•454 



+ 36 



19-8 



30-1 



25-0 



+ 103 



1-4 



9 6 











NW 2- 



11 ,, 



•420 



•458 



+ 38 



18-9 



30-4 



24-7 



+ 115 



1-4 



9'6 











NW 2- 



Midn't. 



•434 



•469 



+ 35 



17-5 



30-0 



237 



+ 12 5 



0-5 



8-3 



... 









NNW2- 



Means \ 































and 1- 



30-403 



30-432 



+ 29 



22-9 



321 



27-5 



+ 92 



2-2 



9-5 



7*50 



9-30 



•00 



•00 



0-6 



Sums. J 











1 





















