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BEN NEVIS OBSERVATORY-LOG-BOOK, 1902. 



Jan. 3. — Frequent flashes of sheet lightning seen dur- 

 ing the hour 23 to midnight. 



Jan. 4. — Strong, squally, variahle north-westerly winds 

 accompanied with heavy showers of snow and hail all 

 day. Vivid flashes of sheet lightning seen between h 

 and l h . 



Jan. 5. — Thermometer box changed after the 9 o'clock 

 observation. 



Jan. 7. — The temperature has been steady all day, 

 between 31° and 32°, with heavy drizzling rain; all 

 exposed objects are thickly coated with ice. 



Jan. 8. — The rain Avhich has fallen during the last few 

 days, with the temperature at or below 32°, has covered 

 the snow on the hilltop with a sheet of ice. 



Jan. 10. — Thermometer box changed at 20 h 20 m . 

 Height above snow 41 inches. 



Jan. 12. — Thermometer box changed after the 14 b 

 observation. 



Jan. 13. — Sky cloudless in early morning and again in 

 the evening, but continual thin fog passing. 



Jan. 14. — Sky cloudless except for a little cirrus during 

 the day, but in the evening cloudy with cirro-stratus. At 

 16 h cum. fog seen on hills in distance to W., which came 

 slowly creeping up every hour, and the summit was 

 enveloped at 22 h . Fog crystals forming all evening. 



Jan. 15. — Drizzling rain since 8 h , which has converted 

 the snow on hill-top into a sheet of ice. 



Jan. 16. — Temperature still continued steady between 

 31° and 32°. This evening, steps had to be cut in the 

 ice from tower to Stevenson screen and rain gauge. 



Jan. 20.— Mist with rain till 9 h ; from h till 3 h the 

 amount registered was 1"026 inches. Summit clear after 

 ll h , but sky overcast or almost so with cir.-s. and cir.-cum. 

 moving rapidly from S.W. and W.S.W. Detached fog in 

 valleys most of the day. Air dry at times since 13 h . 

 Lowest humidity 32 per cent, at 14 h . At 15 b a mock-sun 

 was seen, at 18 h and 22 h a lunar halo, and at 21 h lunar 

 coronse. Thermometer box changed at 13 h . Height 

 above snow 36 inches. 



Jan. 22. — After 4 h the mist sunk below the summit. 

 Sky somewhat cloudy during the clay with cir. and cir.-c. 

 moving slowly from S.W. The mist rose up again in the 

 evening and enveloped summit. Temperature high, but 

 unsteady all day, and air dry at times, the lowest humidity 

 being 50 per cent, at 7 h . Fog-bows and glories seen at 

 9 h , 10 h and ll h . 



Jan. 25. — Thermometers changed after 20 h . 



Jan. 26. — Fog till 10 h , clear since, but sky cloudy. 

 Lunar halo seen from 21 h till midnight inclusive. 



Jan. 27. — Sky overcast with cir.-s. and cir.-c. till ll h . 

 Fog thereafter with slight showers of snow. Air very 

 dry at times in the forenoon, the lowest humidity being 



26 per cent, at 9 h . Air very clear, especially so to S. and 

 S.W. A lunar halo seen at l h , 2 h and 3 h . 



Jan. 29. — Thermometer box changed at h 15 m . 



Jan. 30. — Air exceptionally dry and clear after 4 h , the 

 lowest humidity being 14 per cent, at 21 h . Sky cloudless 

 all day, except for a little cirrus moving slowly from K". A 

 little fog on hills to E. and S.E. in early morning and over 

 Locheil during the day. The cirrus seen at 5 h was ribbed, 

 resembling the shape of an opened fan, the apex being 

 about 7° above the southern horizon, and the rays extend- 

 ing to the zenith. 



Jan. 31. — Pressure high all day. The reading at 23 h , 

 viz. 26 "258 inches, is the highest recorded at this Obser- 

 vatory, being - 003 higher than that in January 1896. 

 The air has been exceptionally dry all day, the lowest 

 humidity being 11 per cent, at 17 h , and the mean for the 

 day 22 per cent. Sky cloudless and air very clear all day. 

 A little fog in valley to S.E. in early morning and over 

 Locheil and Loch Lochy during the day. 



Feb. 1. — Air dry, the humidity ranging from 12 to 

 53 per cent., and sky cloudless down to horizon all day. 



Feb. 2. — Air very dry all day, the mean humidity being 

 39 per cent. A little cirrus on sky in forenoon, but clear- 

 ing away in the afternoon. Fog below all round most of 

 the day, on which glories were seen in afternoon. 



Feb. 3. — Sky cloudless, but fog all round and passing 

 at times during the day. Lunar coronse seen at 6 h and 

 glories during the day. 



Feb. 4. — Sky cloudless, but fog below all round and at 

 times rising up and enveloping hill-top. Glories seen at 

 13 u . 



Feb. 7. — Summit clear after 7 h , but sky slightly clouded 

 with cirrus during the rest of the day. Air very dry at 

 times, the lowest humidity being 37 per cent, at 21 h . 

 Aurora seen at 21 b and 22 h , not very bright. 



Feb. 8. — Sky cloudy, or overcast with cir. and cir.-s. 

 moving rapidly from N. till 16 h . Fog since, with showers 

 of snow. Air very clear and dry till 16 h ; lowest humidity 

 18 per cent at 2 h . 



Feb. 9.— Summit clear from 15 h to 17 h , and sky nearly 

 cloudless, but great banks of fog on surrounding hills 

 and frequently passing over hill-top. Thermometer box 

 changed at 15 h 15 m . Height above snow 56 inches. 



Feb. 10. — Summit clear frequently during the forenoon 

 and sky apparently cloudless, but fog hanging about the 

 lower hills around. 



Feb. 11.— The thermometer box was changed after 9 h , 

 height above snow not altered. 



Feb. 12. — The thermometer box was changed after 19 1 '. 

 Height above snow not altei'ed. Lunar corona at 19 h . 



feb. 13.— Fog from 3 h till 6 h , clear and for the most 

 part cloudless the rest of the day. During the forenoon 



