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DE. S. CHAPMAN ON THE LUNAR DIURNAL MAGNETIC VARIATION, 



TABLE IV. Differences in the Phase Angle 9 in the Formula s\n(2t + 6) for the 

 Lunar Semi-diurnal Magnetic Variation, at Perigee and Apogee, as determined 

 from a number of half-lunations centred at these epochs. 



(a) Declination West. 



(b) Horizontal Force. 



(c) Vertical Force. 



