1903.] 



BEN NEVIS OBSERVATORY. — LOG-BOOK. 



551 



March 14. — After 18 h an addition was put to the 

 thermometer ladder, and the box was raised one step. 

 At 2 h 15 m the thermometer box was changed. Lunar 

 coronse noted at l h and 2 h . 



March 15. — Fog all day, except from l h to 6 h , when 

 sky was cloudless, but fog was rising from Glen Nevis and 

 passing over the hill-top. Lunar coronse at l h and 3 h . 



March 16. — Fog-crystals forming very rapidly all day. 



March 17. — At 23 b , while a heavy shower of snow-hail 

 was falling, St Elmo's Fire was seen very brightly. 



March 23. — Thermometers only changed after 14 b . 



March 24. — Thermometer box raised one step at 18 h . 

 Height above snow 50 inches. 



March 25. — Summit clear and air dry from 13 h 

 till 18 h but sky overcast, the clouds tipping hills all 

 round. Earth currents in telegraph cable between 16 h 

 and 17\ 



March 27.— St Elmo's Fire seen at 20 h . At 15 b the 

 snow-post A. was completely buried, but was dug up and 

 an extra post nailed on to it. The depth of snow to-day 

 (103 inches) is the greatest since 1894. 



March 29. — Earth currents in telegraph wire between 

 23 h and midnight. 



March 30. — Frequent flashes of lightning seen between 

 2 h and 4 h . 



March 31. — Thermometer box changed and raised to 

 top step of ladder at 15 h 10 m . 



April 2. — Thin fog, with short clear intervals during 

 the day. Air dry from 12 b to 16 h . Thermometers only 

 changed after ll h . 



April 8. — Summit clear at times in forenoon, sky 

 apparently cloudy. Lunar coronse seen at 21 b and 22 h . 

 Thermometer box changed after 12 h . 



April 9. — Thin fog or mist all day. Silver thaw from 

 22 h till midnight. 



April 10.— Silver thaw till 4 h . The clouds after 4 b 

 sank down to about the level of summit, leaving sky 

 almost cloudless ; about same time temperature fell 3° 

 and wind veered from S.W. to W.N.W. After 6 h 

 the clouds below rose up again and enveloped summit 

 during the rest of the day. Glories were seen at 6 h . 



April 12. — -Thermometer box changed after 4 h . 



April 14. — Summit clear at times between 9 b and I7 h , 

 but sky overcast, or nearly so, the clouds tipping hills all 

 round. Thermometer box changed after 13 h . 



April 15. — Summit clear from 9 h till 21 h , but sky very 

 cloudy. Fog on hills to N. and E. most of the day and 

 frequently brushing over summit. Heather burning on 

 hills around. Thermometer box changed after 10 h . 



April 16. — Fog or overcast sky all day. Banks of fog 

 hanging about hills most of the day. Thermometer box 

 changed after ll b . A snow-bunting seen at bucket stage 

 in afternoon. 



April 17. — Detached fog on hills to S. in forenoon. 

 Atmosphere somewhat hazy during the day ; probably 

 due to heather burning. Thermometer box changed after 

 9 h . Thermometers only again changed after 20 b . 



April 18. — Sky cloudless till 3 h , thereafter cloudy or 

 overcast, with cir.-s. and cum.-s. till 7 h ; fog during the 

 rest of the day. At 5 h a peculiar dark blue haze seen at 

 horizon to S.W., becoming lighter in colour towards S.E. 

 and N.W. The fog in afternoon was quite white and 

 the fog-crystal deposit hard and flaky. 



April 19. — Summit clear at 6 h , but fog below all 

 round to about 4000 feet. At 18 h the sky was well 

 covered with cir.-s., and a solar halo with mock suns 

 was seen. Air very clear, the Outer Hebrides being 

 seen at 16 h and 17 h . 



April 20. — Summit clear, but sky cloudy or overcast 

 till 7 h ; fog since. Low lying fog in valleys in early 

 morning. 



April 21. — Banks of fog hanging about hills all day. 

 Two snow-buntings seen on Observatory roof in afternoon. 



April 22. — Fog on hills high up, and passing over 

 summit frequently during the day. 



April 23. — Clear but cloudy weather all day. Haze 

 all round in afternoon. Between 4 h and 8 h ascending 

 currents in Glen Nevis, and fog passing over summit 

 at times. 



April 24. — Sky cloudless till 10 h ; slightly cloudy, with 

 cir. and cir.-s. till 18 h , then cloudless again, but at 23 h 

 loose fog was passing overhead, and at midnight fog had 

 enveloped the summit. Thick haze around all day. 

 Heather burning in every direction to day. Snow- 

 bunting seen on tower at 17 h . 



April 25. — Haze around all day. Snow-bunting seen 

 on bucket stage in afternoon. 



April 26. — Sky cloudless, and air slightly dry till 5 h , 

 fog off and on since. Thick haze around, but clearer 

 in afternoon. 



April 28. — Glazed frost till 4 h . Fog, with occasional 

 sunny intervals during the day. Fog-crystals (brown) 

 forming all day. At 20 h and midnight the crystals 

 were icy and needle-pointed. Mist was observed at 

 those hours. 



April 29. — Icy sharp pointed crystals, with minute 

 dark specks forming on all exposed surfaces in early 

 morning. 



April 30. — Strong earth currents in telegraph cable 

 in afternoon. 



May 1.— Sky almost cloudless from 2 h till 6 h , but 

 fog on hills to E. and S., and at 6 h spreading round to N. 



May 2. — Icy crystals forming between 3 b and 8 b , and 

 again after 20 b , very rough and jagged. 



May 3. — Clear at 5 h and 6 h , but sky cloudy, with 

 cir.-c. and cir.-s., the former moving slowly from S.S.W., 

 and haze and fog on hills below ; mist during the rest of 

 the day. 



May 6. — Summit clear from 18 h till 21 h , but sky 

 cloudy and fog on hills all round. Thermometer box 

 changed after 20 h . 



May 7. — Fog on hills most of the day, and passing 

 at times over hill-top. Air very clear to W. in afternoon, 

 the Outer Hebrides looming up in distance. Sun set 

 to-night at 20 b 17 m over middle of Cuillin range. No 

 cloud at horizon in that direction, but no green flash 

 was seen. 



May 8. — Summit clear at times during the day, but 

 sky overcast, or nearly so, with cir.-c. Detached masses 

 of fog hanging about hills all day. Very hazy in after- 

 noon. 



May 9. — Fog on hills around all day, which in the 

 evening rose up and formed banks all round summit. 

 Earth current in telegraph cable at l h 46 m . 



May 10. — Great banks of fog around all day, but 

 breaking up and clearing away in the evening. 



