Meteorological Observations for February 1828. 317 



The mean temperature of spring water at 8 A.M. is only -rW of 

 a degree less than the mean temperature of the external air, which 

 seems to prove that the additional thermometrical heat near the 

 ground in the summer, is balanced by the decrease of temperature 

 in the opposite season, when the sun's diurnal arc with us is much 

 shorter, and his rays more oblique. 



The difference between the annual mean temperature of the air 

 as taken daily at 8 A.M. and 8 P.M. is only «24?, or a quarter of 

 a degree. 



Wind. — The scale of the prevailing winds this year deviates very 

 little from that of last. High winds prevailed in January, February, 

 March, April, October, and December ; but in the other months 

 the winds were comparatively light. The number of strong gales, 

 or the days on which they have prevailed this year, is as in the fol- 

 lowing scale : ■ 



Here the number from the S.W. is remarkable, as usual. The 

 weather in January and February was cold ; and in March, Sep- 

 tember, October, and December it was wet, but rather dry in the 

 other eight months. 



The amount of evaporation this year is considerably under the 

 depth of rain, from the atmosphere near the ground having been 

 more than usually humid in the summer months. 



METEOROLOGICAL OBSERVATIONS FOR FEBRUARY 1828. 



Gosport. — Numerical Results for the Month. 



Barom.Max.30-44Feb.3. Wind N. W.— Min. 28-90 Feb. 21. Wind S.E. 

 Range of the index 1*54. 



Mean barometrical pressure for the month 29*763 



Spaces described by the rising and falling of the mercury 6*250 



Greatest variation in 24 hours 0-570. — Number of changes 1 7. 

 Therm. Max. 61° Feb. 26. Wind SW.— Min. 28° Feb. 12. Wind N. 

 Range 33°. — Mean temp.of exter. air 45°-74. For 30 clays with © in £Z 45*32 

 Max. var. in 24 hours 17°-00— Mean temp, of spring water at 8 A.M. 51°-56 



De Luc's Whalebone Hygrometer. 



Greatest humidity of the air in the afternoon of the 25th 100° 



Greatest dryness of the air in the afternoons of the 3rd & 15th ... 59 



Range of the index 41 



Mean at 2 P.M. 71°*6— Mean at 8 A.M. 82°-l— Mean at 8 P.M. 81-8 



of three observations each day at 8, 2, and 8 o'clock 78*5 



Evaporation for the month 0-75 inch. 



Rain near ground 1-515 inch.— Rain 23 feet high 1-395 inch. 



Prevailing Wind S.E. 



Sum- 



