CORRESPONDING CHANGES 



nil: 



DIURNAL MAGNETIC DECLINATION, 



OBSERVED AT 



MARBURG (ZU HESSE,) 

 LATITUDE 50 48' 47" N. ; LONGITUDE 8 4^ 25" E. 



AN ACCOUNT OF THE INSTRUMENT AND MODE OF OBSERVATION, 



DR. C. L. GERLING, 



PROFESSOR OF MATHEMATICS, kc., lie. 



