Meteorological Obsetvatiotisfor yJpril 1830. 465 



OBSERVATIONS ON THE PLANET VENUS IN THE DAY-TIME. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1830. 



Gosport: — Numerical Results for the Month. 



Barom. Max. 30-26. April 26. Wind S.W.— Min. 29-26. April 3. WindN.W 

 Range of the mercury 1-00. 



Mean barometrical pressure for the month 29-807 



Spaces described by the rising and falling of the mercury 6-680 



Greatest variation in 24 hours 0-840. — Number of changes 20. 

 Therm. Max. 66°. April 29. Wind E.— Min. 28°. April 4. Wind. N.E. 

 Range 38°.— Mean temp.of exter. air 49°-73. For 30 days with O in T 47-47 

 Max. var. in 24 hours 22'-00. — Mean temp, of spring-water at 8 A.M. 47-86 



De Luc's Whalebone Hygrometer. 

 Greatest humidity of the atmosphere in the evening of the 22nd ... 100° 

 Greatest dryness of the atmosphere in the afternoon of the 4th ... 48 



Range of the index 52 



Mean at 2 P.M. 67°-8.— Mean at 8 A.M. 73°-7.— Mean at 8 P.M. 81-7 



of three observations each day at 8, 2, and 8 o'clock ,,. 75" 1 



Evaporation for the month 2-70 inches. 



Rain in the pluviameter near the ground 3-235 inches. 



Prevailing wind, S.W. 



Summary of the Weather. 

 A clear sky, 6; fine, with various modifications of clouds, 13 j an over- 

 cast sky without rain, 3 ; rain, 6. — Total 30 days. 

 Clouds. 

 Cirrus. Cirrocuniukis. Cirrostratus. Stratus. Cumulus. Cuniulostr. Nimbus. 

 18 12 24 18 19 17 



Scale of the prevailing Winds. 

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

 4 2 3i 4 11 3 6 30 



• The distance was not correctly ascertained, in consequence of the 

 interposition of a cirrus cloud, through whicli Vcnns was but faintly seen. 

 These observations were made here merely to show that Venus may be 

 seen with tiie naked eye in the day-time, wiiile passing to or from her in- 

 ferior conjunction when within 20 degrees of tiie sun j and tliat her alti- 

 tude and distance from his centre can at the same time be correctly taken 

 with a telescope and sextant. 



The .'Jtli being a fine sunny day, sixteen spots of various sizes were seen 

 on the eastern side of the sun's disc in the form of a right angle, six of 

 which were inclosed by two umbrae, and two of them were each 3000 miles 

 in diameter. 



N.S. Vol. 7. No. 42. June 1830. 3 O General 



