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BEN NEVIS OBSERVATORY-LOG-BOOK, 1901. 



Jan. 2.— Faint St Elmo's Fire at 1\ 



Jan. 3. — Glories were observed at 12 h , mist crystals 

 of clear ice forming in the evening. 



Jan. 4. — Glazed frost in the morning. Beautiful 

 satiny fog crystals forming to-day pretty rapidly. 

 Changed thermometers after 13 h . 



Jan. 5. — The fog cleared at ll h , leaving an almost 

 cloudless sky. The shadow of Ben Nevis was seen at 15 h , 

 the earth's shadow at 16 1 '. Dark fog crystals forming in 

 the morning and forenoon. Raven seen near the cliff, 

 flying towards Cam Dearg, at 15 h . Changed ther- 

 mometers after ll h . 



Jan. 9. — Clear, with heavy cumulus clouds from 6 h to 

 9 h , after which fog came on again, but cleared off at 

 16 h , leaving a cloudless sky ; thick fog, however, persisting 

 below. Thermometers changed after 6 b , again changed 

 after I7 h . The Stevenson Screen shifted up one step on 

 the ladder. Height of bulbs above snow 52 inches. 



Jan. 14. — Mist, with slight rain, till 5 h . Summit 

 clear, but sky cloudy since. Haze all round below. 

 Temperature high all day, and air very dry at times, 

 lowest humidity 34 at 18 h . Sun rose at 8 U 41 m and set 

 at 16 u 17 1U . Three ravens seen near the North Cliff. 

 Thermo neters changed at 9 h 10 m . 



Jan. 15. — Sky slightly cloudy, with cir. and cir.-s. 

 till 18 h ; cloudless since. Strong S.E. winds all day, 

 blowing a gale in the evening. Slight haze below all 

 day. Earth shadow seen at 16 h . 



Jan. 24. — Fog all day, except at 9 h , when summit was 

 clear but sky overcast. A quick fall of 5° in temperature 

 occurred between 19 u and 20 h and wind veered from S.W. 

 to N. ; the barometer rose rapidly at the same time ; it 

 had been falling previous to this. St Elmo's Fire seen at 

 21 h . The snow which fell in the evening was not the 

 kind which usually accompanies St Elmo Fire, but large 

 moist flakes. Thermometers changed after the 9 1 ' obser- 

 vations. Height above snow 43 inches. 



Jan. 25. — Earth currents in telephone at 17 h 15 m . 



Jan. 28. — Clear and sunny from 12 h to 15 h , but fog in 

 valleys, and at times rising up and passing over summit. 

 Thermometer box changed after the 13 h observation. 

 Thermometers again changed after 17 h . 



Jan. 30. — St Elmo's Fire seen at 2 h . 



Feb. 2. — Thin fog during forenoon, and sun gleaming 

 at times. Summit clear, and air dry after 16 b , but sky 

 overcast, and fog on hills around. Fog on again at mid- 

 night. Earth's shadow and shadow of Ben Nevis seen. 

 Thermometer box changed at 10 h 15 m . Height above 

 snow 57 inches. 



Feb. 5. — Very squally, variable winds, chiefly N., all 

 day, with considerable drift, large pieces of snow being 

 blown up N. cliff, and flying about hill-top all afternoon. 



Feb. 6.— Thermometer box changed at 3 h 10 m . Ther- 

 mometers again changed at . 



Feb. 8. — Sky cloudless, or almost so, but fog all round 

 below, at times rising up and passing over summit till 16' 1 . 

 Fog since. Fog-bows and coronse seen at 2 h , 3 h , and 4 h , 

 and glories during the day. Thermometer box changed 

 at 2 h 15 m . 



Feb. 9. — Sky cloudless, but fog all round and passing 

 till 5 h . Thin fog on summit during the rest of the day. 

 Lunar coronse and fog-bows seen at 2 h , 3 h , 4 b , and 5 h . 



Feb. 10. — Summit cleared after 3 h , leaving sky cloud- 

 less till 8 h . Overcast, or almost so, till 15 h ; fog thereafter. 

 No fog below in the early morning, except for a little 

 over Loch Lochy. Thermometer box changed at 4 h 15 m . 



Feb. 11. — Summit clear during most of the day. A 

 little fog below in the forenoon. Glories seen at 9 h . 

 Thermometer box changed at 8 h 15 m . 



Feb. 13. — Fog cleared off summit after 3 h , leaving sky 

 cloudless during the rest of the day. Air very clear to 

 W., the Outer Hebrides showing well in the afternoon. 

 Some cumulus above horizon, and a little fog on hills 

 below during most of the day. Thermometer box 

 changed at 4 h 15 m . 



Feb. 14. — Sky almost cloudless till 17 h . Overcast, and 

 fog till 20 h , cloudless again since. A little fog over Loch 

 Lochy and to E. during the day. Shadow of Ben Nevis 

 and earth's shadow seen at 17 h . West-coast lights seen 

 all evening. 



Feb. 19. — Sky cloudless till 6 h , almost overcast with 

 cir.-c. till 13 h , thin fog since. Fog over Loch Eil and 

 Loch Lochy in the morning. Air very clear and dry in 

 forenoon. West-coast lights were seen in the early 

 morning. An aurora seen at 22 b , but, owing to fog pass- 

 ing, the streamers were very indistinct. 



Feb. 20. — Sky almost cloudless all day and air very 

 clear and dry, the lowest humidity being 20 at 7 h . 

 Fog all round in the morning to about 3500 feet, but 

 sinking after 10 h . No fog below after 13 u . Aurora seen 

 at 4 b . 



Feb. 21. — Sky cloudless till 5 h . Cloudy, and fog 

 passing at times till 13 h ; fog since. Fog all round below 

 in forenoon to about 4000 feet, on which glories were seen. 

 Earth shadow seen at 17 h 45 m . 



Feb. 22. — Thin fog, with clear intervals, during the day. 

 Glories and fog-bows seen at 8 h . Fog crystals forming 

 all day. 



Feb. 27. — Fog cleared off summit after 14 h , leaving sky 

 cloudless, except for a little scud, till 17 h . Fog below all 

 round in afternoon, but towards evening it had all cleared 

 away. Earth shadow seen at 19 h . Thermometer box 

 changed at 16 h 10 m . 



Feb. 28.— Sky cloudless, and air slightly dry till ll h . 



