OF THE TOTAL FORCE. 



25 



Annual Inequality in the Diurnal Variation of the Total Force. The comparison 

 of the above diurnal variations for summer and winter, with that of the whole year, 

 is given in the following table : 



Those tabular quantities are exhibited in diagram E, which closely resembles 

 diagram B, Part VIII, of the Vertical Force. 



(E). SEMI-ANNUAL INEQUALITY IN THE DIURNAL VARIATION OP THE TOTAL FORCE. 



2 4 



8 10 g 14 16 18 20 22 21" (+21.1") 



4 December, 1864. 



Philadelphia mean time. 



