318 Meteorological Observations for February 1830. 



METEOKOLOGICAL OBSERVATIONS FOR FEBRUARY 1830. 



Gosport: — Numerical Results Jbr the Month. 



Barom.Max.30-33.Feb. 15. Wind N.E.—Min. 29-43. Feb. 7. Wind S.W. 

 Range of the mercui-}' 0-90. 



Mean barometrical pressure for the month 29-910 



Spaces described by the rising and falling of the mercury 5-000 



Greatest variation in 24 hours 0-440. — Number of changes 23. 

 Therm. Max. 53° Feb. 26. Wind S.W.— Min. 13^. Feb. 2. Wind N.E. 

 Range 40°.— .Mean temp.of exter. air 3G°-07. For 30 days with in ;^32-87 

 Max. var. in 24 hours 26°-00.— Mean temp, of spring-water at 8 A.M. 46-95 



De Luc's Whalebone Hygrometer. 



Greatest humidity of the atmosphere, several times 98° 



Greatest dryness of the atmosphere in the afternoon of the 18th,.. 58 



Range of the index 40 



Mean at 2 P.M. 76°-6.— Mean at 8 A.M. 82°-7.— Mean at 8 P.M. 87-5 



of three observations each day at 8, 2, and 8 o'clock 82'3 



Evaporation for the month 0-72 inch. 



Rain in the pluviameter near the ground 1-245 inch. 



Prevailing wind, S.W. 



Summary of the Weather. 

 A clear sky, 3i ; fine, with various modifications of clouds, 9 ; an over- 

 cast sky without rain, 10 j foggy, 2^ j rain, 3. — Total 28 days. 



Clouds. 



Cirrus. Cirrocumulus. Cirrostratiis. Stratus, Cumulus. Cumulostr. Nimbuj. 



16 10 27 2 10 12 16 



Scale of the prevailing Winds. 



N. N.E.' E. S.E, S. S.W. W. N.W. Days. 



2i 5 2| 3 1| 9 2 2h 28 



General Observations.— The weather this month has been mostly frosty, 

 with a humid and cloudy atmosphere, and occasional gales of wind. The 

 first six days and nights were extremely cold. Early in the morning of 

 the 2nd the ground was lightly covered with snow, and a thick crust of ice 

 continued all day on the inside of the windows in apartments with fire. 

 The maximum temperature of the air did not exceed 21 degrees, and the 

 minimum was within 13 degrees of zero; consequently this was the coldest 

 day and night here, during the last fifteen years at least ; and we suspect 

 that a lower temperature has not been fairly registered in the south of 

 England and in the vicinity of the sea, since Six's thermometer has been 

 in use. The day was fine, with light snow, and the night cloudless, with 

 a dry gale from N.E. At the time of this low temperature at 11 o'clock 

 P.M., a wet finger, after being exposed to the wind about two minutes, 

 adhered to a bar of iron : spittle applied to the same bar became solid ice 

 in four seconds of time, and in six seconds on a fir rail. An adherence of 

 a wet finger to iron did not succeed with a temperature of IG degrees and 

 a moister wind; therefore, in this as well as in former experiments, it ap- 

 peared that the drier the air is, whether in motion or quiescent, the more 

 rapid is the congelation of water, &.c. It also snowed on the 3rd, which was 

 nearly as cold as the preceding day. On the 4th the ice had much increased 

 in Portsmouth harbour, in some places to the distance of three hundred 

 yards from the western shore. Light snow descended in the morning of 

 the 5th from a mixture of black and white cumuli: the night was very cold, 

 the minimum temperature being 1 4 degrees. Haslar, Weevil, Portchester, 



and 



