AND ITS CHANGE WITH LUNAR DISTANCE. 



173 



TABLE III. Differences in Phase Angle in the Formula sin (2t + 6) for the Lunar 

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

 number of short periods centred at these epochs. 



(a) Declination West. 



(c) Vertical Force. 



