1904.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



629 



round up till noon. It then commenced to disperse, and 

 was only observed in the distant valleys to west at night. 



July 11. — Fog in the valleys or on horizon all day. 

 Haze in the afternoon, becoming denser at night. 



July 12. — Cum.-fog appeared on the south-east horizon 

 at 9 a.m., and approached steadily till at 22 1 ' the summit 

 was enveloped in mist. 



July 13. — Thunder and earth currents at 13 h 15 m . 



July 19 — Almost cloudless sky most of the day, 

 though somewhat hazy. 



July 20. — Sky almost cloudless in the morning, with 

 fog in valleys. Overcast in the afternoon. Mist in the 

 evening. 



July 24. — Sky cloudless in early morning. Fog all 

 round below all day, passing over summit at times in the 

 afternoon. 



July 25. — Fog or mist till 19 h , cloudy or overcast 

 thereafter. Air dry at 23 h and midnight. 



July 26. — Summit clear all day, though air somewhat 

 hazy, and fog below all round. 



July 27. — Sky almost cloudless till 14 h , but fog below 

 and passing over summit at times. Overcast from 15 h 

 onwards. 



July 31. — Earth currents in telegraph cable at 14 h and 

 15 h . Thunder and lightning at 22 h 17 m , 22 h 22 m , and 

 22 h 39 m . 



Aug. 7. — Earth currents in telegraph cable between 

 l h and 3 h . 



Aug. 8. — Sky almost cloudless till 6 h , but fog in valleys, 

 which rose up and enveloped summit during the rest of 

 the day. 



Aug. 9. — Fog-bow seen at 5 h . 



Aug. 10. — Two weasels seen near stable in forenoon. 



Aug. 11. — Except for a little fog passing in afternoon, 

 summit has been clear all day. Hoar-frost on ground in 

 morning and again at midnight. West coast lights seen 

 at l h and 2 h . 



Aug. 12. — Sky cloudless till 6 h . Fog or mist since. 

 Hoar-frost on ground till 4 h . 



Aug. 14. — A sharp heavy shower of hail fell between 

 17 h and 18 h , and a peal of thunder was heard at 17 h 19 m . 



Aug. 17. — Summit clear after 2 h , but sky somewhat 

 cloudy during the rest of the day. Detached fog in 

 valleys to S. and E. in morning, but dispersing after 8 h . 

 Hoar-frost on Observatory roof at 6 h . 



Aug. 18. — Slight haze around and detached fog in 

 valleys to N. in forenoon. Hoar-frost on ground and on 



Observatory roof in early morning. Earth currents in 

 cable between 14 h 28 m and 15 u 55 m . A slight shower of 

 sleet fell between 15 h and 16 h . 



Aug. 20. — Fog till 20 h . Summit clear and sky almost 

 cloudless since. Dark banks of cloud low to W. at 

 midnight. Lunar coronae in evening. 



Aug. 22. — Sky almost cloudless till 4 h . Fog off and on 

 during the rest of the day, with occasional slight showers 

 of hail. Hoar-frost on ground in morning. 



Aug. 24.— Fog till 9 h . Cloudy till 18 h . Sky cloudless 

 since. Hoar-frost on ground at 22 h , 23 h , and midnight. 



Aug. 25. — Sky cloudy, with cir.-s. moving quickly from 

 S.W. till 5\ Fog or mist since. A lunar halo seen at 

 l h , 2 h , and 3 h . Hoar-frost on ground at 2 h and 3 h . 



Aug. 29. — Summit clear after 15 h , and sky cloudless, 

 except for a little cirro-cum. Thick haze round the horizon 

 all afternoon. 



Aug. 30. — Sky cloudless or almost so till 6 a.m. Fog till 

 10 h . Summit clear again till 16 h . Mist since, with heavy 

 rain. Thick haze around all day. Low-lying fog in 

 valleys to N. and E. in early morning. 



Aug. 31. — A fall of about 5° in temperature took place 

 between 2 h and 3 h , and the wind veered from S.W. to 

 N.W., accompanied with very heavy rain. 



Sept. 6. — -Exceptionally heavy fall of rain in early 

 morning. Between l h and 2 h , 0*541 inch was registered. 



Sept. 7. — Showers of sleet and hail in the afternoon. 

 Earth currents in cable between 10 h and ll h . 



Sept. 11. — Sky cloudless till sunset, except for a little 

 alto-cum. in afternoon. 



Sept. 19. — Summit clear all day, but thick haze all 

 round in valleys. 



Sept. 20. — Summit clear all day, but air hazy. 



Sept. 21. — Summit clear till 20 h , when fog began to 

 brush summit. Air hazy. Shadow of hill seen on haze 

 bank at 6 h . 



Sept. 22. — Summit clear most of the day, but air hazy. 

 Shadow of hill seen on haze bank at 6 h 30 m . 



Sept. 29. — Hoar-frost on ground before 3 h . Glory seen 

 at 10 h 30 m on W. ridge. 



Oct. 1. — This forenoon the barometer stood at about 

 25 inches. The temperature ranged from 30° to 33°. 

 The wind was W. to N.W., blowing about 10 miles an 

 hour. Snow was falling, and mist enveloped the summit. 



By command of the directors, the observations were 

 discontinued at this Observatory after the noon readings 

 were recorded. 



TRANS. ROY. SOC. EDIN. — VOL. XLIV. 



4 L 



