368 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



[1901. 



Large banks of cloud were seen rising to W. and S.-W. 

 after 15 h , and at 16 h the Ben was enveloped in fog, and 

 remained so for the rest of the day. 



Nov. 3. — Mist till 8 h , clear though somewhat cloudy 

 till 19 h , and cloudless thereafter. Thick haze lay in the 

 surrounding valleys throughout the day. A great number 

 of snow-buntings were flying about the Observatory all day. 



Nov. 4. — Summit clear most of the day, with fog all 

 round to W., S., and E., and thick haze to N. 



Nov. 7. — Summit clear till 14 b , but thick fog lay 

 over the surrounding hills to about 4000 feet, and was 

 gradually rising all forenoon. After 15 h the Ben was 

 enveloped in a thick mist, and slight drizzling rain fell 

 till midnight. 



Nov. 14. — About l h a mouse was caught in the passage 

 leading to visitors' room. 



Nov. 15. — Summit clear, and sky slightly clouded 

 till noon, cloudless thereafter. Thick fog lay over the 

 surrounding hills, and was passing over the Ben till 

 5 h , gradually sinking and dispersing in the afternoon. 

 Several of the west-coast lights were seen from 18 h till 

 midnight. After 8 h the thermometers were changed. 



Nov. 21. — Summit clear after 16 h , but air saturated, 

 owing to passing fog. Lunar corona? were observed at 17 b , 

 19 h , and 21 h , and a lunar halo at 18 h . 



Nov. 22. — Clear, and sky practically cloudless all day. 

 During the forenoon there was some detached fog over 

 the surrounding hills, which at times passed over the Ben. 

 This, however, cleared away in the evening, and a slight 

 haze formed in the valleys. 



Nov. 23. — Cloudless, but somewhat hazy till noon, thick 

 fog passing thereafter till midnight. Fog lay over the 

 Moor of Rannoch and Glenmore all forenoon, dispersing 

 about midday. A lunar corona was noted at 21 h . 



Nov. 29.— Glazed frost at 5 h , 21 h , and midnight. 



Dec. 3. — Fog till 10 h . Clear, but somewhat cloudy there- 

 after till 21 h . Thick fog lay over the hills all round, 

 except to E., rising gradually towards evening, and 

 at 22 h the hill-top was enveloped in mist. 



Dec. 9. — To-day the depth of snow has gone up rapidly, 

 there being 23 inches at 15 h . Stevenson Screen (winter 

 pattern) put out to-day on Ladder No. 2 at 10 1 ' 10 m . 

 Height above snow 41 inches. 



Dec. 11. — Fog, with showers of snow, till 21 u . Sky 

 cloudless since, but thin fog constantly passing over the 

 summit. Thermometer box raised one step up at ll h . 

 Height above snow 51 inches. 



Dec. 12. — Except for a little fog passing over hill-top 

 during the day, the summit has been clear and sky 

 cloudless. Detached fog on hills to E. and W. all day. 

 Glories and fog-bows seen at 15 u . Thermometer box 

 changed at l 1 ' 10 m . Height above snow not altered. 



Dec. 1G. — Sky almost cloudless, but fog in valleys 

 below all day, which rose at times and passed over 

 summit ; 'it finally settled on hill-top at 23 u . Lunar 

 coronas seen at 17 h and 18 h . Thermometer box changed 

 at 2 h 20 m . Height above snow not altered. 



Dec. 17.— Silver thaw at 9 h , 10 h , 13 h , and 14 h . 



Dec. 19. — Thermometer box changed at 8 h 25 m . 



Dec. 20. — Sky apparently cloudless most of the day, 

 but great banks of fog high up all round, which kept 

 continually passing over summit. Feathery fog-crystals 

 forming all evening. Lunar coronse seen during the 

 evening. Thermometer box changed at 15 h 15 m . Height 

 not altered. 



Dec. 21. — Thermometer box changed at 19 h 15 m . 

 Height above snow not altered. 



Dec. 22. — Sky cloudless till 12 h . Cloudy, with cir. -cum. 

 and cir.-s. till 23 h . Fog since. Detached fog in valleys 

 and thick haze around all day. Air very dry in forenoon, 

 the lowest humidity being 18% at 8 h . The earth's shadow 

 seen at 9 h , lunar coronse at 17 h , and a lunar halo at 18 h , 

 19 h , and 20 h . 



Dec. 23. — Summit clear from 3 h till 9 h , thick fog since. 

 Fog crystals, dark brown in colour, forming all after- 

 noon. 



Dee. 24. — Summit clear at 2 h , but sky almost overcast 

 and fog high up all round. This morning the cat caught 

 a mouse. 



Dec. 29. — Summit clear at 2 h and 3 h , but sky cloudy, 

 and fog all round high up and passing at times. Fog or 

 mist during the rest of the day, with showers of snow and 

 drizzling rain. In the evening silver thaw, all exposed 

 objects being coated with ice. Lunar coronse seen at 

 2 h and 3 h . Thermometer box changed at 2 h 15 m . 

 Height above snow not altered. 



