460 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



[1902. 



cloudless till 9 h , then fog came on, but lifted occasionally 

 in the afternoon. During the forenoon fog lay over the 

 surrounding hills to about 3800 feet level, only a few of 

 the higher hills being visible. Glories were noted at 6 h 

 and a fog-bow at 8 h . The sky was cloudy or overcast 

 most of the day, with fog rising from the valleys and 

 passing over the Ben at times. 



Sept. 11. — The sky during the day was almost overcast 

 with cumulus. Fog and haze lay in the valleys all day. 



Sept. 12. — A rainbow was noted at 13 h . After 22 ll the 

 thermometers were changed. 



Sept. 14. — After 4 h the fog fell below the level of the 

 Ben, and remained over the surrounding hills till after 

 14 h , rising then and enveloping the Ben for the rest of 

 the day. Fog-bows were noted at 8 h and 9 h , and again 

 at 12 h , and glories observed at 13 h and between 15 h and 

 16 h . 



Sept. 18. — The Ben was free of fog most of the even- 

 ing, but fog lay over the distant hills to S.E. Lunar 

 coronse observed at 21 h and 22 h . 



Sept. 19. — Fog lay over the surrounding hills through- 

 out the day, passing over the Ben occasionally in the 

 afternoon. A lunar halo was noted at l h and 3 h and 

 again at midnight, and a solar halo at 9 h . 



Sept. 27. — The summit was clear and the air dry 

 throughout the day. The sky was cloudy or overcast, 

 and fog lay over the surrounding hills and haze in 

 valleys. After 6 h a hawk was seen flying over the 

 summit, and in the evening about a dozen ravens were 

 flying about the north cliff. 



Sept. 28. — Cloudless most of the day. Fog and haze 

 lay in the surrounding valleys, rising gradually towards 

 night. Fog-bow at 12 h . After the 6 h observation a 

 ptarmigan was seen flying past the Observatory. 



Sept. 29. — Cloudless till after 3 h . Fog in valleys, 

 rising slowly and enveloping the summit between 3 h and 

 4 h . The summit was clear again from 16 h till 20 h , but 

 the sky was overcast. 



Sept. 30. — Mist till 21 h , thereafter the sky was 

 cloudless and the air very clear. Most of the West- 

 coast lights were seen from 22 h till midnight. 



Oct. 1. — The summit continued clear and the air dry 

 till 16 h , after which the fog rose from the valleys and 

 enveloped the hill-top for the rest of the day. 



Oct. 3. — Somewhat cloudy till 16 b ; cloudless thereafter. 

 Fog lay in valleys during the early morning and a thin 

 haze in the afternoon. 



Oct. 4. — In the forenoon fog lay over Locheil and 

 the Caledonian Canal ; this, however, lifted before noon, 

 and a thin haze lay in the valleys the rest of the day, 

 and at midnight the Ben was enveloped in fog. 



Oct. 8. — The summit was clear most of the day, but 

 the sky cloudy and fog over the surrounding hills, which 

 passed over the Ben occasionally. 



Oct. 9. — Summit clear all afternoon and sky cloudless 

 at night. Thick haze below. 



Oct. 10. — Low-lying fog on Caledonian Canal, Loch- 

 eil, and other lochs around at 6 h . This fog cleared 

 gradually and was all gone by ll h . Cum. -fog was forming 

 at 12 h on tops of lower hills. At 13 1 ' this stratum had 

 risen to level of summit Cumulus overhead in evening, 

 descending and disappearing at night. Lunar corona 

 seen at 19 h . Snow-bunting seen about summit. 



Oct. 11. — Low-lying fog on lochs at 6 h , much the 

 same as yesterday, disappearing by 12 h . Detached 

 cum. -fog forming over lower hills at 12 h ; at level of 

 summit at 13 h ; above summit as stratus at 14 h ; falling 

 again in evening ; enveloping summit as fog from 20 h 

 to 22 h ; disappearing by 23 1 ', leaving a cloudless sky above. 

 Snow-bunting seen at noon. 



Oct. 12.— Hoar-frost at 3 h . Solar halo at 9 h . Snow- 

 bunting seen at ll h . 



Oct. 14.— Snow-bunting seen at 17 h . 



Oct. 17. — Summit clear at night. Lunar corona at 

 21 h . Thermometers changed at 20 h 30 m . 



Oct. 18. — Detached cum. -fog on hills in early morning, 

 which gradually rose during the forenoon, passing the 

 summit, and forming stratus and cum. overhead in early 

 afternoon, falling in the evening. Besides this stratum 

 of fog which rose and fell during the day, there was a 

 stratum of lower fog in early morning and till ll b , over 

 Locheil, which did not appear to rise, but gradually 

 disappeared in situ. A glory was seen in distance at 

 8 h . The following measurements per Stephanome of the 

 radius of some colours were secured : — 



Shadow. Smudge of light. Dark space. 



Yellowish Green. 

 2° 12' 



Red. 

 2° 55' 



Blue. 

 3° 25' 



Green. 

 4° 16' 



Yellow. 



Red. 

 4° 53' 



ll 1 



Lunar corona at 22 h . Raven seen in precipice at 

 Snow-buntings heard at ll h and seen at 17 h . 



Oct. 21. — Heavy showers of snow-hail at 9 h , 10 h and 

 ll 1 '. Snow-bunting at 17 h . 



Oct. 25. — Summit cleared at 22 h last night, and 

 remained clear till 7 h to-day. Fog or mist thereafter. 

 Low-lying fog on Canal and Locheil at 6 h . Ditto and 

 also detached cum.-fog on hills and passing summit at 7 h . 

 Lunar corona at l h . 



Oct. 27. — The cir.-s. clouds to-day very gradually 

 increased in amount from 5 h till 14 h , and at the same 

 time apparently fell to a lower and lower level, until 

 they became high dense stratus by I7 h , and mist at 21 h . 

 The temperature rose decidedly as they neared the 

 summit. At 17 h horizon dirty green to north-westward; 

 at the same time very thick haze was seen advancing from 

 S.E., S., and S.W. Snow-bunting seen at 7 h . Rainbow 

 (segment of) seen from M c Lean's Steep at 15 h 45 m . The 

 colours were, reading towards centre — red (outside), yellow, 

 blue, violet, trace of red. 



Oct. 28.— At 13 b small bit of halo seen, with two 

 faintly marked mock-suns on each side of sun and one 

 vertically above. Glories and fog-bows seen after 10 h , 

 too fleeting for exact measurements. At one time the 

 fog-bow was double. Observed, as regards glory, that 

 there was always only the blotch of white round shadow 

 and one red ring outside this. Three measurements 

 were scured — fog-bow, 43° 37'; red of glory, 1° 22', 

 1° 16'. All forenoon the summit seemed to be in the 

 top of a dense layer of cloud-fog that spread all round 

 below. 



Nov. 1.— At 10 h a little hail was falling— very small, 

 hard pellets of white snow and clear ice mixed. 



N 0V . 2.— At 16 h and 17' 1 the fog was fairly thick, 

 and of a dull yellowish colour. Tracks of weasel seen 

 about the tower, outside, to-day. 



