Table IX.—Monthly mean sun-spot number, and annual inequality of sun-spot number as referred to the 
inequality, at epochs of sun-spot minimum and maximum. 
558 
MR. W. ELLIS ON THE RELATION BETWEEN MAGNETIC DIURNAL 
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the declination and horizontal force curves were constructed from the numbers of the two preceding tables. 
The scales employed in Plate 24 are relatively the same as before used, that is to say, one minute of arc of 
declination is taken to correspond to ‘0003 of horizontal force, and to 20 ’0 of sun-spot number. 
