REV. R. F, WHEELER, M.A., AND DR. HOOPPELL. 



483 



Mean Velocity of the Wind, in miles per hour, in the several Months of 

 1871, at Alnwick Castle, and at Durham University. 



MONTHS. 



Alnwick. 



Durham. 



MONTHS. 



Alnwick. 



Durham. 





12-61 

 17-25 

 17-24 

 10-83 

 9-05 

 7-83 



10-31 



13-67 



13-99 



8*57 



8-36 



7-67 





12-74 

 13-21 

 10-40 

 13-00 

 13-93 

 16-94 



8-20 

 8-33 

 6-93 

 8-08 

 10-46 

 12-02 







March 



September 





October 



May 



November 





December 







Mean for Whole Year Alnwick, 12-92: Durham, 972. 



In the above the figures foi* Alnwick are obtained by taking 

 the mean between the greatest and least velocities, attained by 

 the wind each day, as the mean velocity of the wind for that day. 



Accidental errors crept into the return of the "calculated aver- 

 age velocity" of the wind at Alnwick in the Meteorological Re- 

 port for last year. The numbers given are generally twice as 

 great as they should have been. The following are the correct 

 figures, and it is recommended that they should be altered in 

 the report for 1870 w T ith a pen. 



Calculated Average Velocity of the Wind, in miles per hour, at Alnwick, 

 in the severed Months of 1870. 



MONTHS. 



Velocity. 



MONTHS. 



Velocity. 





12-6 

 16-4 

 13-5 

 16-2 

 16-0 

 11-9 





11-1 

 8-9 

 12-3 

 15-3 

 11-4 

 15-0 







March 









May 















Mean for Whole Yp: 



U- 13*4. 













Similar errors occurred in the last three months of the preced- 

 ing year, 1869. 



Mr. George Clayton Atkinson, of Wylam, has kindly furnished 

 the percentage of wind from each quarter, and the mean direc- 

 tion of the wind in each month, at Wylam. These interesting 

 results are appended below. The percentage of wind from each 

 quarter at Wylam may be compared with the percentage of wind 



