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BEN NEVIS OBSERVATORY. — LOG-BOOK. 



77 



at 7 h , and a solar halo at 10 h . The earth shadow was seen 

 at 8 h and again at 16 h . 



Nov. 29. — There was too much drift about at 23 h and 

 midnight for the satisfactory working of the raingauge, so 

 no gauge was out at these hours. It was doubtful whether 

 snow was falling then or not. Fog crystals were forming 

 all day. 



Nov. 30. — The top was clear and the sky cloudless from 

 18 h till 22 u (inclusive). At 20 h 15 m the thermometer 

 box was shifted. 



Dec. 2. — Mist on top till 21 h — cloudless afterwards, but 

 sky had rather a misty appearance, and the S.W m . horizon 

 looked very dark. The thermometer box was shifted at 

 22 h 15 m . 



Dec. 4. — The top was clear at White glare at times 

 times in afternoon. At 12 h a double ^?J^ J46°6' 

 fog-bow was observed. At 13 h and Darkle, 38° 22' 

 14 h the fog-bow was triple — each bow White \ o 4 ° 12 » 

 being coloured. The arrangement of Red / 

 the colours was as per margin. The w ^ ite |32° 32' 

 measurements were obtained by Qi orv \° 3' 45" 

 stephanome. The 46° 6' bow was the Sun 

 brightest, the measurement of the 

 34° 12' one is doubtful. A glory was also seen of only 

 one red ring. The mist on which the fog-bow was formed 

 was somewhat thin and distinctly toet. At 15 h everything 

 was dripping. The earth shadow was seen at 16 h . 



Dec. 8. — St Elmo's Fire was seen at 23 h . Snow was 

 falling at the time — loose and dry, with small round par- 

 ticles among it. 



Dec. 10.— Bright meteor seen at 6 U 4 m — path, from be- 

 tween Castor and Pollux to between Capella and B. Aurigse. 

 Thermometer box was shifted at 6 h 30 m . Mist on summit 

 till 5 h , but clear for rest of day. Some cirrus on sky in 

 afternoon lying N.W.-S.E., and moving from N ds (1). 

 Detached fog in some of the valleys all day, and thick 

 haze at night. Another meteor was seen at 24 h 5 m . It 

 fell almost perpendicularly in N.E rn . sky from about 60° 

 alt. to 20° alt. A lunar corona was seen at 17 h . 



Dec. 11. — Summit remained clear till 11 a.m., but was 

 enveloped after that. Thick haze in valleys around, and 

 fog on the E rn . hills all forenoon. During the forenoon 

 hours a peculiar type of cloud was observed in sky. It 

 consisted of a thin fibry sheet of cloud raised in places 

 into waves and hummocks. At times the top of the 

 cloud was visible, at times the under surface, and at times 

 the edges. At 12 h , when the air temperature was 23° - 7, 

 rain drops were falling. 



Dec. 12.— Summit" clear from 10 h till 20 h . Thick haze 

 in valleys, aud detached cum. f. in the haze. There was 

 no haze above the cum. f. There were two strata of 

 upper clouds to-day : the higher, the usual filmy cir.-str. 

 type, and the other cir.-str. also apparently, but detached 

 and hard, with well-defined edges, and showed dark against 

 the sky or the upper cir.-str. Near the horizon this lower 

 cir.-str. looked like cum.-s., with thin detached sheets of 

 stratus here and there. Fleeting glories were seen at 10 h , 

 12 h and 13 h . 



Dec. 13. — The fog was very thick at times to-day, and 

 the snow crystals deposited were brown. 



Dec. 14. — A lunar corona was seen at 22 h . The top 

 cleared at 23 h . At 23 h 15 m the thermometer box was 

 shifted. Fog on again at midnight. 



ROY. SOC. TEANS. EDIN. — VOL. XLII. 



Dec. 15. — At 6 h the sky above was cloudless, but there 

 was stratus at the horizon, and through an opening in this 

 stratus to N.W ds ., the sky was bright — the brightness 

 being apparently due to the aurora. All afternoon a 

 continual drizzle was falling from mist, and forming a 

 erust of clear ice on all surfaces. 



Dec. 16. — Triple lunar coronas were seen at l h and 2 h , 

 and fog-bows at 2 h and 3 h . The mist was very wet all day,, 

 aud formed a thick coat of clear ice on all exposed surfaces. 



Dec. 17. — A solar corona was seen at 9 h . 



Dec. 18.— Top clear from 7 h till 21 h . At 7 h a lunar 

 corona was seen. It was very vivid. Immediately round 

 the moon was a bright yellow ring of about twice the 

 moon's diameter. Outside this was the usual yellowish 

 white glare with red to outside, then a vivid spectrum- 

 coloured ring. The yellowish white glare was at times 

 momentarily broken up into one set of spectrum-coloured 

 rings, though this seemed to be of less diameter than 

 the glare itself. Thin cir.-str. was in front of the moon, 

 which had a yellowish ring round it when no fog was 

 passing, but it seemed brighter and more sharply defined 

 when the corona was visible. The earth shadow was 

 seen at 8 h 45 m . The thermometer box was shifted after 

 9 h . There was thick haze in the valleys all day, and 

 fog on the lower hills to 4000 feet — continuous till noon, 

 but detached thereafter. The radiating points of the 

 cirrus in afternoon were S.W. and N.E. Thick fog on 

 summit after 21 h . 



Dec. 20. — The top was clear at times about midday, 

 but stratus fog lay on the lower hills, and the sky was 

 overcast. The radiating points of the cir.-str. clouds were 

 S.S.W. and E.N.E. 



Dec. 21. — Top clear at times in forenoon. At 2 h a 

 lunar corona was seen. At 16 h it was noted that the fog 

 crystals that had been forming till then were brown. 



Dec. 24. — The top was clear at times in afternoon. 

 At 16 h 5 m the thermometer box was shifted. 



Dec. 25. — Owing to heavy drift there was no rain- 

 gauge out between 13 h and 19 h . The amounts for these 

 hours on the monthly sheet are interpolations. 



Dec. 26. — St Elmo's Fire was seen on kitchen chimney 

 at 6 h . Small spherical snow falling at the time. 



Dec. 27. — Snow-hail falling in early morning, drifting 

 heavily from ll h till 15 h , but apparently there was no 

 snow falling. Though not drifting so heavily after 15 h 

 the measurements of amount of snow are yet very 

 unsatisfactory. At 23 h a bright display of St Elmo's 

 Fire was observed. Snow-hail was falling at the time 

 heavily. 



Dec. 28. — At 20 h the summit was clear and the sky 

 cloudless, but only for a short time. At 20 h 20 m the 

 thermometer box was shifted. 



Dec. 29. — Fog till 8 h , summit clear for the rest of the 

 day, but, except at 14 h , the air was saturated. At 21 h , 

 23 h , and midnight the aurora was seen as a single badly- 

 defined arch bow to N ds . 



Dec. 30. — The sky was almost cloudless till ll h , but 

 overcast with cir.-str. till 16 h . Fog came on at 17 h . The 

 earth shadow and the shadow of the Ben were seen at 9 h . 

 There was stratus fog lying on some of the hills and over 

 the lochs most of the day. The country all round was 

 white to sea level to-day — the whiteness of the lowest 

 100 to 200 feet being due to hoar frost. 



