WINDS. 165 



registered by F. Cholmeley, Esq., at Brandsby (200 feet above 

 the sea), we have the following results, corrected to mean tem- 

 perature (47'8) : 



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



29-8163 297862 29-8293 29-6834 29-6126 297323 29-6769 29-7007 



The highest pressure is observed with east winds, the lowest 

 with south winds; the difference between them being 0-2167 

 inch. 



The barometer is subject to daily fluctuations or tides of such 

 a nature, that in the latitude of Britain it rises twice to maxima 

 (about 9 or 10 A.M. and 9 or 10 P.M.), and sinks twice to mi- 

 nima (about 4 A.M. and 4 P.M.). The amount of this fluctua- 

 tion diminishes from the equator northward to lat. 64 8' N., 

 where it is reduced to nothing. Farther to the north it re-ap- 

 pears, but in such a manner as. to sink in the late morning and 

 evening, and rise in the early morning and afternoon. On 

 ascending above the general level of the earth in the latitude 

 of Yorkshire, an effect happens of the same kind as that which 

 is experienced on proceeding toward the pole*. 



I was able, by combining the labours of some friends, in 1832, 

 1833, and 1834, to obtain the values of these curious oscilla- 

 tions at York. 



The height of the barometer is on the average greatest nearly 

 at 9 A.M., least at 4 P.M.; the second maximum occurs nearly at 

 9 P.M., and the second minimum at 4 A.M. If we take as the 

 standard the barometrical readings at 4 P.M., the general result 

 is thisf: 



A.M. P.M. 



489 4 9 10 



+ + + + + 



0075 -0163 ' -0178 Standard. '0170 -0162 



* Forbes, in Edinh. Trans. 1831. 



t See Reports of Yorkshire Phil. Soc. for 1832, 1833, and 1834. 



