78 Meteorological Observations for November 1827. 



METEOROLOGICAL OBSERVATIONS FOR NOVEMBER 1827- 



Gosport. — Numerical Results for the Month. 

 Barora. Max. 30-40 Nov. 5. Wind N W.—Min. 29-28. Nov. 29. Wind N.W. 

 Range of the mercury 1-12. 



Mean barometrical pressure for the month . 29-964 



for the lunar period ending the 18th instant .... . . 29*872 



for 14 days with the moon in North declination . . . 30*057 



for 15 days with the moon in South declination . . . .. 29*687 



Spaces described by the rising and falling of the mercury . . . 6-790 

 Greatest variation in 24 hours 0-730. — Number of changes 19. 

 Therm. Max. 62° Nov. 13. Wind N.— Min. 27° Nov. 22. Wind N. 

 Range 35°.— Mean temp.of exter. air 48°-42. For 30 days with in n\ 50*60 

 Max. var. in 24 hours 19°-00— Mean temp, of spring water at 8 A.M. 54°-82 



De Luc's Whalebone Hygrometer. 



Greatest humidity of the air on five different days 100° 



Greatest dryness of the air in the afternoon of the 2nd ; ... 51 



Range of the index 49 



Mean at 2 P.M. 70°-0— Mean at 8 A.M. 79°-2— Mean at 8 P.M. 81-2 



of three observations each day at 8, 2, and 8 o'clock . . 76-8 



Evaporation for the month 0-70 inch. 



Rain near ground 1-835 inch.— Rain 23 feet high 1-690 inch. 



Prevailing Wind N.W. 



Summary of the Weather. 

 A clear sky, 1 \ ; fine, with various modifications of clouds, 9 *, an over- 

 cast sky without rain, 14 ; foggy 1£; rain, 4. — Total 30 days. 



Clouds. 

 Cirrus. Cirrocumulus. Cirrostratus. Stratus. Cumulus. Cumulostr. Nimbus. 

 15 10 27 1 15 19 12 



Scale of the prevailing Winds. 

 N. N.E. E. S.E. S. S.W. W. N.W. Days. 

 6 3i 3 2 4 1 2£ 8 30 



General Observations. — This month has been calm and dry, excepting four 

 or five days, and very mild for the season till the 20th ; afterward it was 

 mostly cold, foggy, and an extremely damp air. 



At 20 minutes part 8 p.m. on the 4th instant, two coloured paraselenes 

 appeared, one on each side of, and 22° 39' distant from, the moon's centre, 

 as determined by the star marked / (Iota) in the left heel of the constella- 

 tion Auriga, which star was conspicuous through, and apparently centered 

 in the paraselena on the northern side of the moon. These mock- moons 

 were formed in a turbid-looking broad band of cirrostratus as it slowly passed 

 the moon's horizontal rays. 



In the afternoon of the 9th there was a curious appearance of nascent 

 cumuli in a long connected range between Gosport and Portsdown Hill ; 

 they had the appearance of whitish columns of steam moving eastward 

 near the surface of the earth with a gentle wind from N.W. 



On the 11th, 18th, 19th, 25th, and 26th, the index of the hygrometer 

 advanced to the extreme moisture point, or 100 degrees, the whalebone on 

 these days being expanded to its utmost extent, by the deposition of dew 

 and thick haze thereon. The dew deposited in the rain-gauge in the nights 

 of the 17th and 18th amounted to four hundredth of an inch in depth. 



From 11 till 12 p.m. on the 18th, a faint aurora borealis appeared in the 

 horizon between the N.W. by N. and N. by E. points. A mild lemon- 

 coloured 



