1902.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



457 



Fog crystals of a 

 The top of the fog 



15 r 



mid- 



fog lay over Locheil, dispersing after 13 h . Thermometer 

 box changed at 8 h 20 m . 



Feb. 14. — Thermometer box changed 10 h 15 m . 



Feb. 15. — Thermometer box changed 12 h 15 m . 



Feb. 17. — Fog till 19 h , after which the hill-top cleared 

 and the sky was partly covered with cirrus or cirro-stratus. 

 A lunar halo was observed from 20 h till midnight, and a 

 lunar corona at 19 h . Thermometer box changed at 20 u 

 I5 m . 



Feb. 18. — Sky partly covered with cirrus, cirro-stratus 

 and cirro-cumulus till 17 h . Thick fog lay all round in 

 forenoon, sinking gradually and becoming more detached 

 towards evening. After 13 h thick haze lay in valleys, and 

 cumulus formed over horizon to E. Lunar halo at l h 

 and a solar halo at 15 b . 



Feb. 19. — Lunar corona at 2 h . 

 light brown colour forming all day. 



Feb. 20. — Fog off and on all day. 

 appeared to be about 4400 feet level till 19 h , after which 

 it rose and enveloped the summit. Glories observed at 

 noon. Thermometer box changed at 7 h 15™. 



Feb. 26. — Thermometer box changed at 8 h 1 5 m . 



March 1. — Thermometer box changed at ll u 

 At ll h two ravens were seen at north cliff. 



March 5. — Glazed frost at 5 h and 6 h . 



March 6. — Glazed frost at 2 h . 



March 7.— Mist till 5 h , and again after 21 h till 

 night. After 5 h the mist fell below the level of the Ben, 

 and lay over the surrounding hills. The sky was slightly 

 covered with cirro-cumulus and cirro-stratus, becoming 

 overcast in the evening. Thermometer box changed at 

 6 h 15 m . 



March 9. — Thermometer box changed at I0 h 15 m . A 

 snow-bunting was seen on summit after ll h . 



March 10. — Fog or mist with occasional breaks till 

 18 h , after which the hill-top was clear and the sky 

 cloudless till midnight, while the air became very dry, 

 the humidity falling as low as 33 per cent at 20 h . At 5 h 

 15 m the thermometer box was changed and again at 19' 1 

 15 m . Height above snow not altered. Two ravens were 

 seen on the hill-top after 17 h . Several of the W. coast 

 lights seen at midnight. 



March 11. — Fog, with occasional breaks in the forenoon. 

 Glories (double ring) observed at 8 U . This evening, one 

 of the observers saw a deer on the hill-side to the south 

 of Buchan's Well, and about the same time a wild goat 

 was seen on the Cairndearg about the same height. 



March 12. — St. Elmo's Fire seen at midnight. 



March 13. — Thermometer box changed at 3 h 15 m . 



March 16. — Fog till 3 h , then the hill-top cleared, and 

 the air became very dry, the humidity being as low as 24 

 per cent at 6 h . The sky was partly clouded with cirro- 

 stratus and cirro-cumulus, and fog lay over the surrounding 

 hills all forenoon. After 16 h the fog rose and enveloped 

 the summit, and drizzling rain fell till 23 h . Glories at 8 h 



and a solar halo at 15 h . Thermometer box changed at 

 41, 15 m, 



March 20. — The thermometer box was changed at T2 b 

 15 m . A lunar corona was noted at midnight. 



March 22. — Thermometer box changed at 7 h 15 m . 



March 23. — The thermometer box was changed after 

 midnight. Height above snow not altered. The depth 

 of snow measured at post A at 15 h to-day was 52 inches, 



being the highest this winter. Lunar corona at 23 h and 

 midnight. 



March 24. — Clear and sunny all day. For a few hours 

 in forenoon, fog lay in the valleys, passing over the summit 

 occasionally, and during the evening there was thick haze 

 all round. Thermometer box changed at l h 15 m . The 

 thermometers were again changed after 12 h . Lunar 

 corona noted at l h , glories at 7 h and 10 h , and a solar halo 

 at 15 h and 16 h . 



March 25. — Fog lay among hills and haze in valleys 

 in the early morning. 



March 26. — Thermometer box changed at 14 h 15 m . 

 The box was again changed at 16 h 15 m . Height above 

 snow 40 inches. 



March 27.— Slight showers of snow till 8 h . The hill- 

 top was clear of fog occasionally in the afternoon, and 

 after 19' 1 the sky became cloudless and the air dry. At 

 midnight the air was very dry, the humidity being 17 per 

 cent. Thermometer box changed at 19 u 10 m . A raven 

 seen at 16 h . 



March 28. — The summit was clear and the air excep- 

 tionally dry till 6 h . At l h the humidity was 8 per cent. 

 There was a thick band of haze over the western horizon, 

 and at 5 h the sky became overcast with stratus cloud. At 

 6 h there was a large shower-cloud over Locheil, and at 7 h 

 the Ben was enveloped in fog. Showers of snow fell in 

 the evening. A lunar halo was noted at 3 h . 



March 29. — At 15 h the thermometer box was raised 

 from 38 to 62 inches above snow. 



March 30. — Lunar corona at 3 h ; six snow-buntings 

 and a raven seen in afternoon. 



April 3. — Thermometer box changed after 8 h . Heierht 

 above snow not altered. The depth of snow measured at 

 15 h to-day was 62 inches. 



April 4. — Thermometer box changed at ll h 15 m . The 

 thermometers were again changed after 17 h . Height 

 above ground not altered. 



April 5. — Fog off and on all day. While the summit 

 was clear the sky was for the most part cloudless, but 

 thick fog lay over the surrounding hills. Thermometer 

 box changed at 2 h 15 m . The thermometers were again 

 changed after 7 h and after 13 h . At 21 h the box was 

 again changed. 



April 6. — Clear all day except for occasional passing 

 fog in forenoon. Cumulus-fog lay among hills all fore- 

 noon and at times was flowing over the Ben. From 19 h 

 till midnight, the sky was cloudless. Thermometer box 

 changed at 12 h 15 m . 



April 7. — Sky covered with stratus or cumulo-stratus 

 from 5 h till 18 h , cloudless the rest of the day. Thick 

 haze lay all round all day. Thermometer box changed 

 at 6 h 15 m . 



April 8. — In the early morning and again at night the 

 sky was cloudless, but very thick haze lay in valleys all 

 day. 



April 9. — Very hazy all day. Fog forming among 

 hills during evening and passing over the hill-top 

 occasionally. Slight shower of snow from 17 b to 18 L . 



April 10. — Cloudless till 6 h , somewhat cloudy the rest 

 of the day. Air very dry all day, except for a few hours 

 in evening, when fog was passing. Slight haze round 

 horizon all day. Heather burning in the surrounding 

 valleys throughout the day. After 19 h theremometers, 



