1892.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



415 



July 27. — Aurora seen at midnight, single arch, no 

 streamers. Haze and fog below at night. 



July 28. — Sky cloudless all day, but fog on hills at 

 3000 feet till 9 h , after which it rose and dispersed, 

 leaving the valleys full of haze with a few patches of 

 fog among it. Northern horizon red all night. 



July 29. — Thick haze and patches of fog in valleys all 

 day. Some of the fog rose and formed cumulus overhead 

 in afternoon and evening. 



July 30. — Sky cloudless, but thin fog blowing over 

 till 4 h . Sky covered with cirrus types. Haze and patches 

 of fog in valleys all forenoon, mist or fog on summit 

 all afternoon, rain came on after 17 h , the first fall since 

 the 23rd. Solar halo seen at 8 h . 



Aug. 1. — At 23 h and midnight top was clear and 

 fog lying among hills round. 



Aug. 2. — Fog lay at a high level — almost 4000 feet 

 till 6 h ; after which it broke up into cum.-fog and 

 rose, getting clear of the hill tops about 10 h ; from 12 h 

 onwards there was continuous fog or mist on Ben Nevis. 



Aug. 9. — Thin fog in forenoon, which, later, rose 

 higher into light cumulus and disappeared. No fog 

 left in valleys. Air very clear all afternoon. South Uist 

 and Barra seen. Bright meteor observed at 22 h 2 m . It was 

 passing close to Mars near S.S.W. horizon when first seen, 

 was green in colour and rather brighter than Mars, and 

 vanished in air to the left of Mars about 5° above horizon. 



Aug. 10. — Clear sky, but fog blowing over hill top 

 occasionally till noon. Continuous fog all afternoon. 

 Glory seen at 6 1 '. 



Aug. 17. — Summit clear all day, but sky partly covered 

 with cumulus except at 19 h and 21 h when it was cloud- 

 less. Fog on hills to 4000 feet till evening, when it 

 sunk down into the valleys and broke up into detached 

 cum.-fog. At 21 h fog had all disappeared. A lunar 

 corona at 2 h and 3 h . 



Aug. 18. — Top clear from 4 h till 8 h , and some fog 

 amoug valleys. 



Aug. 19. — Summit clearing occasionally till 19 u , since 

 then sky cloudless and some detached fog in valleys. 



Aug. 20. — Sky cloudless till 3 h , fog since with some 

 breaks in the afternoon. A double corona at 6 h . 



Aug. 23. — Fog till 9 h , clear for the rest of the day, but 

 thick haze below, and cum. and cirro-c. on sky. 



Aug. 25. — Top clear in morning, but sky cloudy, and fog in 

 valleys all round, which after 8 h rose and enveloped summit. 



Aug. 28. — Frequent showers of drizzle. Snow and 

 hail fell during the day. Mist and fog till 22 h , after 

 which top was clear and sky almost cloudless, but fog 

 over hills all round and passing across summit at times. 



Aug. 29. — Sky cloudless or almost so till 9 h , but air 

 remained saturated till 4 U . Sky cloudy or overcast till 

 16 u , with cum.-s., cir.-c, and cir.-s. Mist came on at 

 17 h , and slight showers of snow and rain fell during the 

 rest of the day. Slight N. breezes or calm till 8 h , 

 and veering to E. and E.S.E. and increasing in force 

 to moderate gale in the evening. Fog all round in early 

 morning to height of Ben Nevis, and passing over summit 

 at times till 4 a.m. after which it sank into valleys and 

 gradually dispersed, giving place to haze in the forenoon. 

 Aurora single arch seen at 2 h and 3 h , no streamers. 



Sept. 4. — Fog till 16 h , summit clear since, but sky 

 more than half covered with cir.-c. and cir.-s. and fo<4' all 



round below. Solar coronae were seen at 17 h and 18 h . 

 Lunar halo at 23 u and midnight. 



Sept. 5. — Luliar halo at l h , after which mist came 

 on and continued all day. 



Sept. 6. — Mist or fog till 2 p.m. Summit clear 

 frequently after that but sky overcast or nearly so. Haze 

 all round below, and detached cum.-fog on hills which 

 gradually spread all round and enveloped the summit after 

 19 h . Air slightly dry from 15 h to 18 h . 



Sept. 8. — Fog till 10 h . Summit clear for the rest of 

 the day except for some thin fog passing occasionally, 

 but sky overcast with cirro-stratus and a few patches of 

 cum.-fog on hills to S. Lunar corona seen at 4 h . 



Sept. 20. — Mist and fog till 20 u , sky cloudless after 

 that and air dry, but fog all round in valleys, fey 

 crystals forming from the mist on windward side of all 

 exposed surfaces in the early morning. Aurora single 

 arch at 22 h , 23 h , and midnight. At 22 h there were 

 shifting streamers to about 40° altitude. 



Sept. 21. — Sky cloudless all day but some fog in 

 valleys till 10 h , and passing over summit in the early 

 morning. Air dry all day and very dry in the evening. 

 A magnificent aurora seen from 20 u till midnight. 

 There were three distinct arches from W. and S. to N.E. 

 with shifting streamers shooting to the zenith. 



Sept. 22. — Temperature high and air very dry all day. 

 Humidity ranging from 28 to 40 per cent. Sky cloudless 

 all day, but a little detached fog in valleys to S.E. and E., and 

 slight haze in valleys all day and some cir.-str. on horizon 

 to W. and N.W. in the afternoon. Air very clear above 

 the haze. The aurora of last night was observed till 

 4 a.m. and again to-night from 20 h till midnight. A 

 single arch and no streamers. 



Sept. 23. — Sky cloudless till 4 U , but some cir.-cum. 

 on horizon to W. and N. Thin fog passing over summit 

 at 4 h and off and on after that till 9 h ; continuous mist 

 since with slight drizzle and heavy rain after 19 u . 



Sept. 29. — Temperature pretty steady all day at 28% 

 with heavy showers of snow and drifting a little in early 

 morning. Average depths of snow on summit about 9 1 

 inches. Wreaths forming round observatory varying in 

 depth from 2 to 3 feet. 



Sept. 30. — Fog or overcast sky except at 4 U when sky 

 was cloudless and thin fog blowing over summit and 

 again after 20 h , when there was detached cum.-fog on 

 surrounding hills. 



Oct. 2.— Summit clear after l h till 5 h , but sky about 

 half covered with cumulus, and fog on hills all round, 

 since then almost continuous mist and fog. 



Oct. 3. — Summit clear after 4 h , but sky overcast with 

 cirro-stratus and cumulo-stratus and thick fog on hills all 

 round till ll h , continuous fog since. 



Oct. 4. — Summit clear after 15 h , but sky overcast with 

 cirrus and cirro-stratus and thick banks of cum.-fog on 

 the surrounding hills, after 20 h sky was cloudless except 

 for some thin scud passing at times. After 23 h fog came 

 on again. Heavy rain till 15 h , fair since. A solar halo 

 at 15 h . 



Oct, 5. — Sky mostly overcast till 9 h , but almost cloud- 

 less at 3 h and thick banks of fog all round, considerably 

 higher than Ben Nevis. Continuous fog after 9 h . A 

 solar corona at 17 h . 



Od. 12. — Top clear, and air dry from 5 h till 14 h , and 



