1897.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



469 



Nov. 24.— Summit clear at 16 h and 17 h , but sky over- 

 cast and fog all round below to 4000 feet. 



Nov. 25. — Summit clear and sky apparently cloudless 

 at 12 h and 13 h . Pretty cloudy at 14\ Fog thereafter. 

 Fog on hills all round to level of summit and passing 

 frequently during these hours. 



Dec. 1. — Box changed at ll h 15 m . Height above 

 ground 42 inches. 



Dec. 3. — Air very dry at times till 4 h , lowest humidity 

 being 23 at l h . 



Dec. 4. — Fog or mist with slight showers of snow and 

 drizzle till 5 1 ' : thereafter summit clear and sky about 

 half covered with cir. and cirro-stratus, and detached fog 

 on hills around till 18 h . Fog since. Air dry from 9 h till 

 16 h . Glories seen at 10 h . Lunar coronsB seen after 19 h . 

 Thermometer box changed at 8 h 10 m . Height above snow 

 40 inches. 



Dec. 6. — Box changed at 4 h 10 m . Height above snow 

 37 inches. Lunar corona seen at l h and 2 h . 



Dec. 8. — Strong earth currents in telephone all day. 

 Thunder and lightning between 4 h and 5 h . 



Dec. 9. — Thermometer raised one step up on ladder 

 after midnight. Height above snow 56 inches. 



Dec. 12. — Summit clear at times in the evening and 

 sky apparently nearly cloudless, but fog on hills all round 

 and passing. Aurora seen at 20 h and a lunar corona at 

 22 h . Thermometer box changed at 18 h 10 m . Height 

 not altered. 



Dec. 13. — A strong gale sprung up from the S.E. 

 after 3 h (force 8 to 9), moderating in force after 8 h , but 

 again increasing after 20 h , and blowing from 90 to 100 

 miles per hour about midnight. Tower box in use after 

 20 h . No correction applied to its readings, duplicate 

 readings having been taken during the day, in which the 

 tower box never differed more than - l from Stevenson 

 Screen. 



Dec. 14. — S.E. gale of last night continued till 2 h , 

 moderating in force somewhat, and wind veering to S-W. 

 till 7 h , backing again to S. or S.E. and blowing pretty 

 briskly during the rest of the day. Summit clear at times 

 after l0 h . The depth of snow to-day is 24 inches, being 

 8 inches down from yesterday. Tower box in use till 3 h . 



No correction applied. Stevenson box changed at I2 h 

 15 m . Height above snow 54 inches. 



Dec. 18. — Fog till ll h . Sky almost cloudless since. 

 Air very dry all afternoon, range of humidity being 23 

 to 37. Thermometer box changed at 12 h 10 m . Height 

 above snow 55 inches. 



Dec. 19. — Sky cloudless and air very dry all day. 

 Lowest humidity 26 at l h . Temperature above freezing 

 point all day, being higher on summit than at sea-level. 

 Haze near horizon and some fog in valleys to E. all 

 day. Foreglow very bright at 7 h . Shadow of Ben seen 

 at 9 h . Hoar frost on ground at sea-level to fully 100 

 feet. 



Dec. 20. — Thin fog passing all day, but sky apparently 

 cloudless. Glories and fogbows seen frequently during 

 the day. Aurora seen at 17 h , 18 h and 19 h . Strong 

 earth currents in telephone in the evening. 



Dec. 21. — Fog till 3 h . Sky cloudless and air dry 

 since. Lowest humidity 22 at 22 h . Somewhat hazy near 

 horizon and detached cum.-fog on hills to E. and S.E. all 

 day. Aurora seen at 3 h and 4 h and again from 9 h till 

 midnight. Hoar frost at sea-level to 100 feet. The 

 shadow of Ben seen at 9 h . 



Dec. 22. — Sky cloudless and air very dry all day, 

 the humidity ranging from 18 to 49. Fog lying over 

 Loch Eil and Loch Lochy and haze in valleys all day. 

 Aurora seen from l h to 5 h , and again from 19 h till mid- 

 night. Shadow of Ben seen at 9 h . A raven seen at 

 15\ 



Dec. 23. — Sky cloudy or overcast with cirro-cum. and 

 cirro-str., moving pretty quickly from the S.W. in after- 

 noon. Haze in valleys all day. Air very dry all day, 

 the humidity ranging from 19 to 67. Hoar frost on 

 ground at sea-level to 500 feet. 



Dec. 24. — Summit clear most of the day, but sky over- 

 cast or cloudy with cirro-str. and cirro-cum. Air dry all 

 day except for a few hours in early morning and again 

 in evening. Lowest humidity 41 at 17 h . Thick haze 

 in valleys and cum.-fog on hills in distance all day. 

 Aurora seen at 21 h . 



Dec. 29. — St. Elmo's Fire and lightning seen at 2 h . 



Dec. 30.— St. Elmo's Fire seen at l h . 



