274 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



[1900. 



Thick haze arouud all day, rising to about 12° above 

 horizon. 



April 1. — Thick haze around all day. Sky cloudy 

 with cirrus and cir.-s. most of the day on which a solar 

 halo was seen at 16 h , 17 1 ' and 18''. 



April 3. — Summit clear at times till 8 h and sky 

 apparently cloudless but great banks of fog on surround- 

 ing hills. Snow falling in the evening, but no rain gauge 

 in use owing to drift. 



April 5. — Thermometer box changed at 22 h 10 m . 

 Same instruments put out again. 



April 6. — Summit clear frequently during the day and 

 air slightly dry. Fog-bow and glories seen at 6 1 '. 



April 19. — Fog in valleys all day. 



May 13. — Fog-bow seen at 19 h . 



May 15. — Fog or mist till 6 h ; clear and sky almost 

 cloudless since. Fog in valleys to N. and S. most of the 

 day. 



May 16. — Fog rising in Glen Nevis after 21 h and at 

 times passing over summit. Solar halo seen at 19 h and 20 h . 

 Thermometer box lowered one step on ladder. Height of 

 bulbs above snow 54 inches. 



May 18.— Hilltop clear from ll h to 20 h but sky 

 overcast, or nearly so. Thin haze all round in afternoon. 

 Snow-bunting seen at 10 h . 



May 19. — Fine sunny weather in forenoon but con- 

 siderable banks of fog on hills to N. and N.E. 



May 22. — Temperature steady between 31° and 33° all 

 day with heavy showers of snow and hail. Summit clear 

 from 16 h to 18 h and air slightly dry. A fog-bow seen at 

 16 h . Earth currents on telephone during the day. A 

 raven seen at bucket stage at ll h . 



May 26. — Summit clear and air slightly dry during 

 the day. Fog on hills below and haze all round. 



May 30. — Sky cloudless till 8 h , slightly cloudy during 

 the rest of the day. Cum. -fog in distance almost all day. 



May 31. — Sky cloudless, or almost so, till 10 h ; cloudy 

 or overcast till 21 h ; fog since. Fog in valleys all round 

 but clearing away towards evening except to S. 



June 1. — Sky almost cloudless in forenoon, a little 

 cum. on sky in the afternoon, cloudless again at night. 

 Fog below all round in early morning on which glories 

 were seen at 4 h . Very hazy to S. all afternoon. The 

 observation at 18 h was taken 15 minutes late. 



June 2. — Not a cloud on sky all day, but fog in 

 valleys in early morning and haze to W. all day. 



June 3. — Haze and fog in valleys most of the day. 

 Sky cloudless till 3 h , a little cloudy during the rest of the 

 day. 



June 4.— Sky cloudless at times, air very clear. Haze 

 low down all day. 



June 5. — Sky cloudless, or nearly so, till noon, but very 

 cloudy thereafter. Fog in valleys to N. in forenoon and 

 thin haze to S. all day. 



June 6. — Thunder and strong earth currents on 

 telephone between 12 h and 15' 1 . 



June 7.— Earth currents on telephone at 3 h 25 m and 

 again at 14 b 55 m . 



June 8. — Mist almost all day. Sun gleaming at 16 h . 

 Slight showers of drizzle at 5 h and 6 1 '. 



June 9. — Mist all day with drizzling rain since 5\ 



June 10. — Earth currents on telephone frequently 

 between 21 h and 22 h . 



June 11. — Strong earth currents on telephone after 

 19 h . The snow has all thawed away from snow-post, but 

 there are still a few wreaths on hilltop and along edge of 

 cliff varying from 1 to 6 feet deep. 



June 12. — Lightning seen at l h 8 m . Thunder and 

 lightning at l h 55 m , apparently close to summit; thunder 

 lasted about 20 seconds, then intermittent lightning, 

 l h 57 m , l h 59 m and 2' 1 3 m . Thunder heard during 

 observation at 2 h . Thunder at 2 h 28 m and strong earth 

 currents on telephone all morning till 7 1 '. Telephone 

 found broken down about noon. Thunder and lightning 

 in distance at 20 h 17 m . Severe thunder and lightning 

 came up quickly from the S.E. and S., the summit 

 being in centre of storm cloud from 20 h 43 m to 20 b 

 59 m . Mist on and heavy lain falling, but clearing 

 as the storm passed to N.N.E., N., and N.W. The 

 office stove and electric connections discharged and 

 exploded seven times, the interval between each flash 

 varying from 3 to 9 seconds, with loud thunderclaps, 

 while hilltop was in centre of storm. Thunder and 

 lightning at intervals in distance till 23 h . None of the 

 observers were injured. The observation at 21 h was 

 taken 15 m late. No daily weather report sent to news- 

 papers to-night, owing to breakdown of telephone. 



June 13. — Thunder and lightning frequently from 

 l h 30 m to 2 h 40 m at intervals of about one minute. 

 Thunder again heard at 16 h 34 m , 16 h 39 m , 16 h 41'", 

 16 h 44 m and 16 h 51 m . 



June 14. — Mist till 10 h , clear since, but sky cloudy 

 and fog passing continuously over summit. Lunar 

 coronae seen at midnight. 



June 15. — Fair, but sky very cloudy all day. Haze 

 below all round and fog in valleys to N. and N.E. in early 

 morning. Lunar coronae at midnight. 



June 20. — Earth currents on telephone in forenoon 

 and again in the evening. 



June 22. — Sky very cloudy till 4 h but almost cloudless 

 after I7 h . Fog all round all day on which glories and 

 fog-bows were seen at 4 h and at 19 h . 



June 23. — Very fine and clear all day. Fog in valleys 

 all morning till 9 1 ' to N.E. and S.E. No fog below after 

 ll h . Passing showers all afternoon to N.E., E. and S.E. 

 Hoar frost on Observatory roof at 2 h . 



June 24. — Foreglow with very fine distinct colours 

 at 2 h . 



June 27. — Fog off and on summit all day and sky 

 apparently almost cloudless. Fog-bows and glories seen 

 at 4 h , 5 1 ' and 7 b and a solar halo at 3 h 45 m . 



June 28. — Summit clear almost all day but sky over- 

 cast, or nearly so. Fog all round and passing at times 

 during the day. Air dry all day, the lowest humidity 

 being 84 at 16 h and 20 1 '. 



June 30. — St Elmo's Fire heard at l h on kitchen 

 chimney and roof of tower. 



July 1. — Glories and fog-bows seen between ll h and 12 h . 



July 2. — A very heavy shower of hail fell between 

 18 h 5 m and 18' 1 22 m , the amount during that time being 

 0-166, only 0-011 falling during the rest of the hour. 

 The hail was pretty large in size and conical in shape. 



July 3.— Rainbow seen at 12 h 55 U1 . 



July 8. — Sky cloudy till 5 h with cirrus and cir.-str. 

 moving rapidly from S.W. Detached fog on hills and 

 in valleys to S.E. and S. 



