426 



Results of Makerstoun Obsekvations, 1844. 



Table XXV. contains the means of the maxhnum pressures of wind recorded by the anemometer between 

 the hours of observation : Table XXVI., which follows, contains the means of the maximum pressures recorded 

 within about 10'" at tlie hour of observation. The latter, therefore, will represent more nearly the mean pres- 

 sure of the wind ; they would require, however, to be multiplied by a constant coefficient to obtain the true 

 mean ; this coefficient has not been yet ascei-tained. 



Annual Variation of the maximum Pressures of Wind. — From Table XXV. the mean of the maximum 

 pressures between the hours of observation was greatest in November and least in July. The following are 

 the means for the meteorological quarters : — 



lb. Ih. 



Winter, Dec, Jan., Feb., 0-42 Summer, June, July, Aug., 0-53 



Spring, March, April, May, 0-6() Autumn, Sept., Oct., Nov., 0-75 



The year 1844,.. 



lb. 

 .0-58 



The pressure is greatest in autumn, is least in winter, and is less in summer than in spring, 

 for July, August, and September is as small as that for winter. 



The mean 



TABLE XXVI. — Daily, Weekly, and Monthly Means of the Pressure of "Wind, in Pounds on the 

 Square Foot of Surface, deduced from the greatest pressures observed within 10"" at the hours of 

 observation, in 1844. 



