554 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



[1903. 



lunar halo at midnight. Glazed frost forming all fore- 

 noon ; in the early morning the ice thus formed was very 

 jagged, resembling pin points. 



Nov. 6. — Sky less than half covered with cirrus till 

 18 h ; cloudless since. Fog low down in valleys all day, 

 but dispersing in the evening except to W. and N. 

 Slight haze in distance all day. Lunar halo seen at l h 

 and 6 h . 



Nov. 7. — Sky cloudless till 16 h . Fog in valleys in 

 early morning to N. and W., but gradually spreading all 

 round in forenoon ; thereafter it rose up above the summit 

 and was passing at times over hill-top, finally settling on 

 the summit after 16 h . Haze in distance all forenoon. 

 Glories seen at 15 h . 



Nov. 9. — Earth currents on cable between h 7 m and 

 h 35 m . 



Nov. 17. — Fog or overcast sky till 17 h ; cloudless sky 

 since, but very thin fog passing. Showers of small star- 

 shaped snow in early morning. Aurora seen at 21 h . 

 Snow on hills all round, and down to about 2000 feet. 

 Thermometer box changed after 12 h . Height of bulbs 

 above snow 44 inches. 



Nov. 18. — Air extremely dry from 3 h till 7 h , the 

 lowest humidity being 16 at 6 h . Mist or overcast sky 

 during the rest of the day. Aurora seen at l h and 2 h , 

 but very faint. 



Nov. 19. — Silver thaw from 7 h till 16 h , all exposed 

 objects being thickly coated with ice. 



Nov. 20. — Glazed frost at 6 h . Earth currents in 

 cable between h and l h . 



Nov. 21. — Thermometer box changed after 14 h . 

 Height above snow not altered. 



Nov. 23.— Aurora seen at 23 h . 



Nov. 24. — Thermometer box changed at 9 h 15 m . 



Nov. 26. — Thermometer box changed at 8 h 10 m . Box 

 raised one step. Height above snow 54 inches. 



Nov. 29. — Sky clear most of the day, but persistent 

 fog passing over summit. From 9 h till midnight the wet 

 bulb has read from one- to six-tenths higher than the dry 

 bulb. Lunar corona seen at 17 h , 22 h , 23 h and midnight. 

 Thermometer box changed at 3 h 10 m . Height above 

 snow 52 inches. 



Nov. 30. — Lunar coronse seen at 23 h and midnight. 

 Thermometers only changed at h 10 m . 



Dec. 1. — Sky almost cloudless during forenoon, but 

 thin fog passing frequently. Summit enveloped in fog 



all afternoon but cloudless again in the evening. Lunar 

 halo at 2 h . Thermometer box changed at 23 h 10 m . 



Dec. 2. — Sky cloudy till 5 h ; fog since. Very black 

 appearance like haze above horizon to W. at 3 h . 



Dec. 7. — Barometer fell rapidly in early morning, 

 during which time a very strong gale was experienced. 

 During the gale there was very thick drift. From 6 h 

 till 9 h the tower thermometer readings were used; no 

 correction was necessary. The temperature rose when the 

 gale had subsided. 



Dec. 8.— From 19 h till 23 h the fog fell into the 

 valleys. Lunar corona observed at 22 h . After 20 h 

 thermometer box was changed. 



Dec. 13. — During the last few days, fog-crystals have 

 been forming rapidly on all exposed surfaces. 



Dec. 18. — Fine though cloudy most of the day; fog 

 again enveloping the summit at night. Aurora seen at 

 6 h . Fox and weasel marks seen in snow in morning. 



Dec. 21. — The fog fell at 9 U , and cirrus clouds were 

 observed. At 17 h and 19 h tower thermometer readings 

 were used, as the observer was unable to keep his 

 lamp alight. After subsequent comparisons with the 

 Stevenson Screen thermometers, a correction of — - 2 

 was applied. 



Dec. 23. — Mist or fog all day ; although no precipitation 

 took place the mist was very wet, and silver thaw 

 coated everything with ice. After midnight the ther- 

 mometer box was changed. 



Des. 24. — The sky was cloudless, and fog lay in the 

 valleys all day. Glories were observed. 



Dec. 25. — The sky was cloudless, and fog lay in the 

 valleys from 8 1 ' onwards. At 19 h the fog dispersed, 

 except in the valleys, to N. Aurora seen at 18 b . West 

 Coast lights seen in early morning. 



Dec. 26. — At 16 h a raven was seen. 



Dec. 29. — Fog with slight breaks till 7 h , when 

 the fog sank into the valleys, and the sky was cloudless 

 during the rest of the day, but with fog passing at times 

 during the forenoon. It was somewhat hazy in afternoon 

 and evening. Glories observed in forenoon, also meteor 

 at 6 h . After 16 h the thermometer box was changed. 

 Ascending currents from Glen Nevis at 15 h . 



Dec. 30. — Very hazy. The sky was cloudless, fog 

 lying on the hills to the S.E. In the evening the fog 

 approached, and from 21 1 ' onwards enveloped the summit. 

 One West Coast lkrht was seen at 4 h . 



