Pl'^u 



Carve 



DIUENAL INEQUALITY. 



Decimation. 



4 



J- 



''V 



'%^ 



.Year 



WirUer 



Summer 



.Nixiynnjtir 



Mid^summer 



Ca/yc 



norizontal Force. 



10 





j:. 



■1010- 



■Kntg^ 



Abscissae time in hours from midnight 



J^- 



-^ 



-^ 



Illmtrating the Report on Comparison and Reduction of 

 Magnetic Observations. 



