1898.1 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



89 



very bright on 

 on top of Tower 



after 8 h . 



March 11.— Glazed frost forming in early morning 

 and forenoon. 



March 13.— Glazed frost at ll h , and St. Elmo's Fire 

 seen at 21 h (very bright). 



March 14. — St. Elmo's Fire seen 

 kitchen chimney and on all posts, etc. 

 at l h and 2 h . 



March 20. — Thermometer box changed 

 Height not altered. 



March 24. — Summit clear after 14 h , but sky cloudy and 

 fog passing frequently. Haze in distance. Thermometer 

 box changed at 16 h 30 m . Height above snow 48 inches. 



March 25. — New top ladder fixed up on thermometer 

 stand No. 2; and box changed at 16 h 30 m . Height of 

 bulbs above snow 57 inches. 



March 28.— Thermometer box changed at 13 h 10 m . 

 Height not altered. 



March 30. — Sky almost cloudless till noon except 

 for a little cir. and cir.-s. ; fog on hills all round, but about 

 noon the fog rose up overhead and formed a cloudy sky 

 all afternoon. Air dry till 20 h ; lowest humidity 49 at 

 8 h and 9 h . Shadow of Ben seen at 6 h . A solar halo 

 seen with mock-suDS at 8 b and 9 h . 



April 4. — Summit clear at intervals from 13 h till 21 h , 

 but sky somewhat cloudy with thin cumulus. Cloudless 

 since ; thermometer box changed at 22 h 10 m . Height 

 above snow 55 inches. 



April 14. — Summit clear since 5 h , but sky somewhat 

 cloudy with cum. and cir. till 20 h , and at times fog passing ; 

 almost cloudless since. Detached fog on hills most of the 

 day, but after 17 h it began to clear away, and at 20 h it was 

 all gone. Thermometer box changed at 5 h 10 m . A raven 

 seen near Bucket Stage in forenoon, and a snow-bunting 

 near Observatory in afternoon. Numerous flies seen on 

 surface of snow between Observatory and M'Lean's Steep. 

 April 15. — Faint aurora seen at 2 h and 3 h . 

 April 18. — S.E ly . winds all day. Summit clear from 

 13 h to 20 h , but sky overcast. Brown fog crystals forming 

 rapidly in early morning. Two snow-buntings seen in 

 early morning. 



April 20. — S. to S.E ly . winds. Brownish fog crystals 

 forming all day. 



April 21. — Summit clear since 5 h , though sky some- 

 what cloudy till 16 h ; cloudless thereafter. Detached fog 

 on hills during forenoon, but by 14 h ithad all disappeared. 

 Haze near horizon all day. Temperature rising all day, 

 the maximum 41°"3 at 18 h being the highest temperature 

 this year. Air very dry at times, the humidity being 

 48 at 18 h and 21''. Glories seen at 5 h . Thermometer 

 box changed at 5 h 15 m . Height above snow 55 inches. 



April 24. — Fog or mist till 5 h , and fog in evening. 

 The fog that enveloped the hill-top in 'early morning 

 sank below the summit, leaving the sky cloudless, but 

 rose again towards noon and formed a cloudy sky of 

 cumulus. Thermometer box changed at 6 U 10 m . A 

 snow-bunting and raven seen to-day. 



May 1. — Fog with showers of snow till ll h . Summit 

 clear, but sky somewhat cloudy with cum. and cir. After 

 that air very clear to W. in afternoon. Fog on hills to 

 E. and S., but towards evening it gradually spread round 

 to W., and by 22 h fog had enveloped the hill-top. 

 May 2.— Solar halo at 15 h . 

 May 6. — Summit clear after ll h , but sky cloudy or 



nearly overcast till 19 h ; almost cloudless since. Air very 

 clear and dry all afternoon, the lowest humidity being 33 

 at 23 h . Fog rising in Glen Nevis at 20 h , but this cleared 

 away shortly afterwards. Glories seen at 20 h . Thermo- 

 meter box changed at 12 h 15 m . Height not altered. 



May 7. — Fine, and air very clear till 15 h , but sky fully 

 half covered with cir. and cir.-str. At 14 h fog in distance 

 to W., which crept up and enveloped summit at 16 h . 

 Slight drizzling rain after 20 h . Air very dry in early 

 morning, the lowest humidity being 36 at l h . At 5 h a 

 solar halo with mock-suns, the former rather indistinct, 

 but the latter bright. 



May 10. — Sky almost cloudless till 5 h . Cloudy or 

 overcast till 9 U with cir.-s. Mist or fog since, with 

 showers of rain and sleet. Fog on hills to E. and S. at 

 3 h , which spread all round except to W., and rose up and 

 enveloped summit by 10''. A solar halo with mock-suns 

 seen at 5 h . Glazed frost at 12". 



May 16. — Two snow-buntings seen at 14 h , and a raven 

 at 16 h . 



May 17. — -From 19 h 30 m , onwards, a solar halo 

 observed with two mock-suns ; the rim of the halo 

 was distinctly visible against an apparently cloudless sky. 

 Solar coronse and glories at times between 1 9 h and 20 h . 



May 18. — Almost calm all day, with bright sunshine 

 and dry air. Thick haze below. Hoar-frost on roof 

 in early morning. An extra temperature reading at 

 16 h 30 m gave Dry Bulb 45"0, Wet Bulb 40-0, the 

 dry bulb reading being higher than any of the hourly 

 ones and the highest since November last. 



May 21. — Fine and clear all day. Visibility 5 at 

 21 h and 22 1 '. Sky very gloomy to E. at 23 h , and 

 overcast at midnight. 



May 23. — About 21 h Neil found a cuckoo lying dead on 

 the snow at the top of M'Lean's Steep (over 4000 feet). 



May 24. — Solar halos in morning. Air dry after 

 20 h ; lowest humidity 36 at midnight. 



May 27. — Solar halo with mock-suns observed at 4 h . 

 Two complete halos : the mock-suns being on the inner one, 

 the one above the sun, and the other to the westward ; con- 

 tact arches extended from each side of the upper moek-sun. 



June 2. — Thermometer box changed after 13 h . 



June 13. — Raven seen at 17 h . 



June 14. — Fine sunny weather. Sky almost cloudless, 

 but thick haze in the valleys most of the day. 



June 15. — Summit clear, but sky cloudy or overcast, 

 and fog in valleys all day. 



June 16. — Summit enveloped in fog at l h , and con- 

 tinued so till 4 h . Sky somewhat cloudy till 17 h ; cloudless 

 thereafter. Fog in valleys most of the day. Solar halos 

 seen at 6 h and 7 h . 



June 17th. — Sky pretty cloudy till 18 h . Fog or mist 

 since. Fog in valleys all day. Solar halo seen at 10 h 

 and ll h . 



June 21. — Strong earth currents in telephone in after- 

 noon, and thunder heard at 16 h 46 m . 



June 24. — The snow has all thawed away at the Snow 

 Post, but there is still a good deal of snow on the hill- 

 top varying from 1 to 8 feet in depth. 



June 26. — Snow-bunting seen on summit cairn after 16 h . 



June 28. — Sky cloudless till 4 h ; slightly clouded till 

 14 h ; overcast; and fog since. Detached fog in valleys in 

 early morning, but this all cleared away by 10 h . 



TRANS. ROY. SOC. EDIN. — VOL. XLIV. 



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