on the Distribution of the Magnetic Intensity. 



49 



REDUCTION OP THB INVERARY OBSERVATIONS. 



CYLINDER, No. I. First Arc 25. 



Log. Reduction of the Flat Needle to Cylinder, No. I. = 0-1066836. 



OBSERVATIONS AT GREENOCK. 



The Observations were made in ilie Field in which Mr HERON'S Observatory stands, and 

 about 120 yards distant from the Observatory. 



CYLINDER, No. I. First Arc 25 



CYLINDER, No. 1. First Arc 25. 



VOL. XII. PART I. 



G 



