8 



AMPLITUDE OF THE SOLAR-DIURNAL VARIATION 



The following table contains the recapitulation of the monthly normals for each 

 hour of the day, and for the mean epoch 1842 to 1843, and forms the basis for the 

 discussion of the diurnal variation and its annual inequality. The table exhibits 

 at one view the mean hourly readings for each month, unaffected by the larger dis- 

 turbances. 



