1889.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



139 



The water in the wet bulb cistern was however not frozen 

 all morning. 



June 16. — Mist till 9 h , after which it cleared off and 

 left sky almost cloudless, but a continuous layer of fog 

 over the hills round. This covered the hills all the rest 

 of the day, except from 20 h to 23 h , when it cleared off 

 those to S.E. The top was from 3500 feet to 4000 feet 

 height. Some glories were seen on this fog in the 

 evening. Two sets of colours, but not very bright, no 

 measurements were got. 



June 17. — Thick cloud or fog layer on hills all round 

 to about 3000 feet till 9 h , after which it broke up and 

 disappeared except a few patches to W. Haze in the 

 valleys all afternoon, getting thicker at night. The 

 horizon was also rather hazy. No upper glow was 

 seen at sunrise or sunset. A little faint pearly cirrus 

 was seen at midnight. The sun was last seen at about 

 gh 21 m . 



June 18. — Sun first seen at 3 h 18 m . Fog lay in the 

 valleys at about 2000 feet height till about ll h , thickest 

 to W. and N, and haze gathered all round during the 

 day. This haze rose distinctly higher than Ben Nevis 

 at night. Dew on all woodwork at midnight. No 

 upper glow was seen before sunrise. 



June 19. — Sun first seen at 3 h 19 m . Horizon hazy all 

 day. Fog gathered in the valleys to N., and extended all 

 round at about 2000 feet height before sunrise. It broke 

 up into cumulus clouds after 10 h . Thin fog was blowing 

 across Ben Nevis at 20 h , but it was quite dry and did not 

 deposit moisture on anything. From 21 h onwards, thick 

 fog lay over Loch Ness and the adjacent valleys, at about 

 2000 feet height. Sun was last seen at 21 h 26 m . Very 

 faint upper glow at 22 h . 



June 20. — The sun was first seen at 3 U 16 m . The 

 earth shadow and Ben Nevis shadow were seen at and 

 after sunrise. The fog in the valleys to N. broke into 

 cumulus at about 8 h , and after that there was no fog in 

 the valleys till about 23 h , when it gathered again to N. 

 beyond Loch Lochy. Horizon hazy all day. The sun 

 was last seen at 21 h 26 m , and the after glow and earth 

 shadow were seen at about 21 h 40 m . 



June 21. — The sun was not seen till 3 h 22 m , owing to a 

 bank of cloud and haze at the N.E. horizon. Dew 

 formed at 3 h on everything, up to that hour there had 

 been none. Fog lay in the valleys to N. beyond Loch 

 Lochy, at about 2000 feet till 9 h , after which it 

 disappeared. A faint upper glow was seen at 3 h . 

 Horizon hazy all day. The upper glow was seen on 

 cirrus at 21 h 40 m * Pearly cirrus was seen to 70° altitude 

 at 23 h , and a small patch to the N.N.W. at midnight. 



June 22.- — Sun was first seen at 3 h 16 m shining 

 through thick haze, which prevented any sunshine from 

 being recorded until after 8 h . The upper glow was seen 

 at 3 h , and the earth shadow after sunrise. On the night 

 between the 21st and 22nd, the lamp was only used at 

 23 h midnight and l h , the thermometers being easily read 

 at all other hours without it. Low fog lay over Loch 

 Lochy and the adjacent valleys to N. till 6 h . At 7 h 

 there was cumulus over Loch Lochy, and after that no 

 fog or cloud in the valleys till 13 h , when loose dry cum. 

 fog gathered to the S. and E. of Ben Nevis, which 

 continued till 18 h . From 22 h onwards, dry fog was 

 drifting across the hill top. The sun sank out of sight 



in a bank of thick haze and cloud, and the time of 

 setting could not be observed. 



June 23. — Sun was first seen at 3 h 37 m . This late 

 time was due to the fact, that thick and continuous fog 

 was lying over all the hills round to about 4000 feet. 

 After 4 h this fog rose higher, and began to pass across 

 Ben Nevis also. It formed cumulus and scud clouds in 

 the afternoon, but sank down again in the evening; 

 being at about 4000 feet height at 18 h , and sinking to 

 not much over 3000 feet by midnight. 



June 24. — The sun was first seen at 3 U 21 m shining 

 through the fog that covered the hills round to about 

 3000 feet. The fog continued at about this height till 9 h , 

 after which it rose and surrounded or covered Ben Nevis 

 for the rest of the day. These fogs for the last few days 

 (since the 19th) have been quite dry, and the air has 

 never been saturated. 



June 25. — Thick haze all round all day, rising higher 

 than Ben Nevis. At 5 h and 6 h the haze under the sun, 

 i.e., from near N. to S.E., was black, and the rest white. 

 Fog over the hills round in early morning, and partly on 

 Ben Nevis also ; this rose and formed cumulus in the 

 afternoon, but cleared off entirely at night. 



June 26. — Haze all round till noon, and fog after that, 

 which gradually began to cover Ben Nevis also, but was 

 always higher than the hill top. 



June 27. — Fog gathered all round in afternoon, form- 

 ing at 20 u a high bank on the surrounding hills, 

 extending from about 3000 to 5000 feet height. By 

 21 h this had gone, except from the hills to N.W. and a 

 few detached portions elsewhere ; and for the rest of the 

 night there was haze and str.-fog on the hills far to N. 



June 28. — Fog on hills all round in great masses from 

 2 h to 4 h , and after that fog on or hanging about the top 

 of Ben Nevis also, but, as far as could be seen, no fog in 

 the valleys below. 



July 1. — Wet mist till 22 h , after which it sank, leaving 

 a cloudless sky, but still covering the hills round at a 

 height of about 4000 feet. 



July 2. — Cloudless sky and fog on the hills round to 

 between 3000 and 4000 feet till 10 h , after which the fog 

 rose, occasionally passing across Ben Nevis, and forming 

 scud and cumulus clouds overhead. It sank down again 

 after 21 h , and formed a similar layer of fog on the hills. 

 Faint pearly cirrus seen all along N. horizon at midnight. 



July 3. — Fog on hills to 4000 feet at l h , but after that 

 it broke up into detached portions ; but there was fog in 

 the valleys till 7 h , after which it disappeared. Air rather 

 hazy all day. At 5 h the haze at the horizon was dark 

 under the sun, i.e., from S.E. to N.N.W., and white 

 round the rest of the horizon. Fog gathered low down 

 in the valleys to N. beyond Loch Lochy after 21 h . 

 Ravens were seen flying about over the hill top in 

 afternoon. Bright pearly cirrus seen to N. at midnight. 



July 4. — Fog lay among the hills to N. as far as the 

 head of Loch Lochy till 8 h , after which it disappeared, 

 but gathered again after 20 h . Air hazy all day. The 

 sun was first seen at 3 h 30 m . 



July 5. — Faint pearly cirrus seen 

 lay thickly at midnight was drying 

 almost entirely gone at 2 h . Fog lay 

 N. and E. most of the day, and in the afternoon Ben 

 Nevis was surrounded by loose, dry, cum. fog rising on all 



at l h . Dew which 

 up at l h , and was 

 among the hills to 



