^66 Meteorological Observations for April 1829. 



not only the latest discovered mineral bodies, but abounds with 

 specimens from Cornwall, which were not uncommon forty or fifty 

 years since, but are now more rarely met with. — Particulars and 

 catalogues may be had of Mr. G. B. Sowerby, 156 Regent-street. 



R. Phillips. 



JMETEOKOLOGICAL OBSERVATIONS FOR APRIL 1829. 



GospoH. — Numerical Results Jbr the Month. 



Barom. Max. 30-00 April 26. Wind N.E.—Min. 28-88 April 14. WindS.W. 

 Range of the index 1-12. 



Mean barometrical pressure for the month 29-497 



Spaces described by the rising and falling of the mercui-y 6-680 



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

 Therm. Max. 65° April 24. Wind N.E.— Min. 31° April 1. Wind N.E. 

 Range 34°.— Mean temp.of exter. air 48°-68. For 30 days with © in ^4803 

 Max. var. in 24 hours 24°-00 — Mean temp, of spring-water at 8 A.M. 49°-94 



De Luc's Whalebone Hygrometer. 

 Greatest humidity of the atmosphere in the evening of the 23rd ... 90° 

 Greatest dryness of the atmosphere in the afternoon of the 22nd 42 



Range of the index 48 



Mean at 2 P.M. 59°-3— Mean at 8 A.M. 67°9.— Mean at 8 P.M. 71-8 



of three observations each day at 8, 2, and 8 o'clock 66-3 



Evaporation for the month 1-60 inch. 



Rain in the pluviameter near the ground 6-465 inch. 



Prevailing winds, S., S.W., and N.W. 



Summary of the Weather. 

 A clear sky, 3; fine, with various modifications of clouds, 12; an over- 

 cast sky without rain, 7 ; rain, 8. — Total 30 days. 

 Clouds. 

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



37 13 30 22 28 27 



Scale of the prevailing Winds. 

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

 2 3 13 6 6 3 6 30 



General Obsenations. — The weather this month has been very wet, windy, 

 and cold at the beginning and end. The April showers, or rather heavy 

 rains mixed with hail, have been constant, and perhaps they will be 

 found ungcnial to the late sown seeds in the low lands, many thousand 

 acres of which have often lain under water on finding its level from the 

 higher ground in this country. Here it has rained more or less every day 

 except three, and so heavy that the depth for April is unprecedented, and 

 nearly four inches more than its average during the last fourteen years ; 

 but on most days sunshine and dry winds occasionally intervened. The 

 reports from Scotland, where particular attention is paid to meteorology, 

 of the cold, wet and windy weather, the backwardness of the spring and 

 vegetation in general, are no better than those in the southern parts of 

 England. In the afternoon of the 2ncl instant, showers of pulpy hail with 

 icy nuclei descended several times and slightly covered the grovmd ; yet 

 the aridity of the air was remarkable at these times ; as a De Luc's whale- 

 bone hygrometer ranged between 40° and 50°, which is considered dry. 



Solar halos on the 4th, 11th, 14th, 15th and 18th, and lunar halos in 

 the evenings of the 13th and 15th, were constantly followed by heavy rain 

 and strong gales of wind. The solar halo which appeared at 2 P.M. on 

 the 15th, was 45 degrees in horizontal diameter, and was intersected at the 



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