Table II.—Annual means of the monthly mean diurnal range of declination and horizontal force as deduced from observa¬ 
tions made at the Royal Observatory, Greenwich. (The declination is expressed in minutes of arc ; for horizontal force 
the unit is ‘00001 of the whole horizontal force. The number standing under January represents the annual mean for 
the year of which the middle point is January 15, and similarly for other months.) 
546 
ME. W. ELLIS ON THE RELATION BETWEEN MAGNETIC DIURNAL 
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