398 Meteorological Ohservatiom for March 1830. 



To J. Yates, Hyde, Chester, calico-printer, for his method or pro- 

 cess of giving a metallic surface to cotton, silk, linen, and otiier fa- 

 brics. — 2Gth of January. — 6 months. 



METEOUOLOGICAL OBSERVATIONS FOR MARCH 1830. 



GospoH: — Numerical Results Jhr the Month. 



Barom. Max. 30-62. Mar. ^6. Wind N.W.— Min. 2.9-50. Mar. 15. WindS.W. 

 Range of the mercury 1-12. 



Mean barometrical pressure for the month 30-123 



Spaces described by the rising and falhng of the mercury 6-400 



Greatest variation in 24 hours 0-640. — Number of changes 15. 

 Therm. Max. 62° Mar. 26. Wind W.— Min. 34\ Sever.al times. 

 Range 28°.— Mean temp.of exter. air 46°-01. For 30 days with in J£ 44-50 

 Max. var. in 24 hours 23°-00. — Mean temp, of spring-water at 8 A.M. 47-23 



De Luc's Whalebone Hygrometer. 

 Greatest humidity of the atmosphere in the evening of the 22nd ... 96° 

 Greatest dryness of the atmosphere in the afternoon of the 26th... 46 



Range of the index 50 



Mean at 2 P.M. 77°-7.— Mean at 8 A.M. ee-^-S.— Mean at 8 P.M. 81-3 



of three observations each day at 8, 2, and 8 o'clock 75'3 



Evaporation for the month 2-10 inches. 



Rain in the pluviameter near the ground 0-62 inch. 



Prevailing wind, S.W. 



Summary of the Weather. 



A clear sky, 7 i ,- fine, with various modifications of clouds, 12 ^ an over- 

 cast sky without rain, 9; rain, 2^. — Total 31 days. 



Clouds. 



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



21 9 24 4 7 12 9 



Scale of the prevailing Winds. 



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

 1 1 3 6i 2i 8 6| 21 31 



General Observations. — This has been a fine and very dry month j indeed 

 so small a quantity of rain has not fallen here in any March for the last 

 ten years. The March of 1820 was also fine and dry, but the mean tem- 

 perature of that period was three degrees lower than that of the present 

 month. A finer time for agricultural purposes could not l)e desired, as no 

 interruption occurred to field labour; and so far as the leafing of the trees 

 and the bloom have advanced, every thing bears a promising asj)ect. 



If there be any truth in the moon's influence over the weather when her 

 phases happen at certain hours, we may anticipate fine growing weather 

 till the end of .July. In August it may probably be changeable, in which 

 case some good may be derived by agriculturists who are acquainted with 

 the principles of the barometer, and will regulate their harvest-work by its 

 indications, in connection with the state of the hygrometer, and the pre- 

 vailing modifications of clouds. 



Lunar halos appeared in the evenings of the 4th and 6th, and were ex- 

 actly 45 degrees in diameter to their interior edaes. 



On 



