1901.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



367 



Aurora seen at midnight. Strong earth currents in cable 

 all evening. 



July 28. — Sky cloudless, except for the fog which 

 surrounded the summit all day and frequently towards 

 midday rose and passed overhead. The roof of Observa- 

 tory was quite soaked with dew at l h . Aurora seen at 

 l 1 '. 



July 29. — Fog all round below all day. 



July 30. — Sky almost cloudless till 3 h , but fog all 

 round below, which rose and enveloped summit till 15 h , 

 when it sunk again, leaving sky cloudless. Fog came on 

 again at midnight. Lunar corona? seen at 23 h . 



Aug. 1. — Summit clear at 22 h and 23 h , and sky 

 apparently cloudless, but fog all round. 



Aug. 12. — A severe thunder storm, accompanied by 

 rain and hail, passed over the summit from 12 h to 15 h . 

 During this period and later earth currents were noted 

 in the telegraph cable. 



Aug. 13. — To-day three sheep were seen on the south 

 side of the hill, quite near the top. 



Aug. 15. — Mist or fog to-day, with slight showers of 

 drizzling rain except when the sky cleared for about 

 ten minutes at 7 h . The barometer has risen slightly 

 and temperature fallen. 



Aug. 16. — Earth current noted at 15 h 8 m . Snow fell 

 at 9 h 20'", but the amount was not measurable. 



Aug. 17. — Fog, with clear intervals, till 8 h . A fog- 

 bow and glory were seen after 8 h . The colours in the 

 bow were very distinct. 



Aug. 21. — The weather to-day was extremely hazy, the 

 visibility seldom exceeding 2. After 15 h the thermo- 

 meters were changed in screen. 



Aug. 24. — From 7 b to 19 h the air was extremely 

 hazy. 



Aug. 30. — At 20 h and at intervals till midnight a lunar 

 corona was seen. At times it was remarkably brilliant. 



Sept. 2. — Air very clear to-day. At nearly all the 

 observations the maximum visibility was noted. 



Sept. 12.— A glory was seen at 23 h 30 m . 



Sept. 13. — Fog-bow and glories at 8.30 a.m. 



Sept. 20. — A rain-bow was observed at 16 h and 18 h . 



Sept. 22.— Glories seen at 9 h 45 m . 



Sept. 24. — Lunar coronse seen at 21 h , 23 h , 24 h . 



Sept. 25. — A lunar halo was observed towards midnight. 



Sept. 28. — Mist, with heavy showers of rain. The baro- 

 meter rose gradually all day, though pumping slightly. 

 The temperature was very high, reaching 49 0. Squally 

 S.W. winds. 



Sept. 29. — At 23 h the sky cleared somewhat, and from 

 then till midnight a lunar corona was observed. 



Sept. 30. — Lunar coronse were observed in the morning 

 till 5 h and again at night about 20 h . A solar halo at 

 9 h and a fog-bow and glories about the same time. 



Oct. 1.— Earth currents in telephone cable after 23 h . 



Oct. 2.— Clear at 9 h and again from 20 h till midnight. 

 Fog or mist the rest of the day, with heavy showers of 

 rain till 8 h . 



Oct. 3. — Lunar corona at l h . At 16 1 ' 45 m a large 

 weasel was seen going from the Observatory, to the 

 Ordnance cairn on the summit. 



Oct. 9.— Fog or mist till 16 h , clear after that. Haze 

 in valleys all evening. Aurora seen at 19 h . 



Oct. 14. — The hill-top remained clear and the air 



slightly dry till 9 h , after which the fog which had been 

 gradually rising from the valleys enveloped the summit, 

 and heavy showers of sleet and snow fell throughout the 

 evening. 



Oct. 15. — Fog at l h . Sky somewhat cloudy the rest of 

 the day. Fog lay in the valleys and over Locheil, Loch 

 Laggan, and the Caledonian Canal all morning, breaking 

 up and dispersing after 10' 1 . Detached fog on surround- 

 ing hills all afternoon. Several of the west-coast lights 

 were seen during the evening. Tracks of a weasel were 

 seen in the fresh snow this morning. 



Oct. 17.— St Elmo's Fire was very brilliant at 20 h , but 

 only for a few minutes. 



Oct. 21. — Summit clear, and sky almost cloudless after 

 3 h , but becoming more or less cloudy during the day and 

 overcast in the evening. Thick fog lay over the surround- 

 ing hill-tops all day, rising gradually and enveloping the 

 Ben at 21 h , remaining so the rest of the day. Fog crystals 

 began forming at midnight. At 7 h 25 m a Stevenson 

 Screen (small pattern) was put out on Ladder Stand No. 

 2, and the temperature readings were taken there after 8 h . 



Oct. 22. — A brilliant display of St Elmo's Fire was 

 observed at 5 h , while a shower of snow was falling. 



Oct. 23.— Fog till 20 h . Clear, and sky cloudless there- 

 after, with thick fog all rouud and passing. Lunar coronse 

 seen at 21 h and 23 h . 



Oct. 24. — Clear more or less till 7 h , when fug, which 

 had been rising gradually from the surrounding valleys, 

 enveloped the summit and continued the rest of the day. 

 Lunar coronse seen between l h and 2 h . 



Oct. 25. — Fog with occasional showers of snow till 22 b , 

 when the fog sank below the level of the summit, and the 

 sky became cloudless. The air remained saturated till mid- 

 night, due to a thin fog passing over hill-top. Lunar 

 coronse seen at 23 h and midnight. 



Oct. 26.— Thermometer box changed at 1 ' 15 m . 

 Height above snow 48 inches. 



Oct. 29. — Large banks of fog lay over the surrounding 

 hills throughout the day, breaking up gradually in the 

 evening, till at midnight only small patches of detached 

 fog on the hills to E. and S. remained. Lunar halo 

 at 20 h . At 16 h a number of snow-buntings were seen 

 flying about the Observatory. 



Oct. 30. — The hill-top remained clear and the sky 

 almost cloudless till 3\ At l h and 2 h haze was forming 

 in the surrounding valleys, and at 3 h fog was rising from 

 Glen Nevis and passing over the summit. After 4 h the 

 Ben was enveloped in a thin fog and continued so till 

 midnight. Glories were observed at 10 h and lunar coronse 

 at 23 h and midnight. 



Oct. 31. — Summit clear and sky cloudless till 4 h , 

 during which time banks of fog lay over the surrounding 

 hills, passing over the Ben occasionally. At 5 h the Ben 

 became enveloped in a thin fog, and remained so till noon, 

 when the sky again became cloudless, and the air dry. 

 During the evening patches of fog hung about the hill- 

 tops to E, and a thin haze lay in the valleys. Lunar 

 coronse were observed at l h , 3 h , aud 6 h . 



Nov. 1.— Sky absolutely cloudless all day. Small 

 patches of fog lay over the hills to E., and thin haze 

 in the valleys all round. 



Nov. 2. — The air continued dry and the sky practically 

 cloudless till 15 h . Thick haze in valleys all morning. 



