The Rev. H. Lloyd on the Mean Results of Ohsei-vatlons. 73 



observations of the year 1843 ; and have calculated the square root of the mean 

 of the squares of these differences, or the values of the expression ^/'-^^^^^l^f. 



71 



The values of this quantity, which may be denominated the mean daily error 

 are the following: ' 



Mean daily Error. 



Magnetic declination, .... Daily error = 0'-95. 



Atmospheric pressure, . . "* q -301 



Atmosplieric temperature, 4°-25 



Now the mean value oin in each month (the Sundays being omitted) is 26 

 Hence the mean correction, in the case of a single deficient observation, is for 

 the magnetic declination, 0'-04 ; for the atmospheric pressure, 0-012 • and for 

 the temperature, 0-17. In the case of the two meteorological elements, and 

 especially in that of the atmospheric pressure, the correction is too consider- 

 able to be overlooked; in the case of the magnetic decUnation, and, probably, 

 also in that of the other magnetic elements, it may be disregarded. 



VOL. XXII. 



