Mr DUNLOP'S Account of Observations made in Scotland 



By comparing the Observations made at Makerstoun, from January 1829 to January 

 1830, it appears that the magnetic intensity of Cylinder, No. I. has remained stationary; 

 whereas that of the Flat Needle has been decreasing, which will be seen by comparing the 

 log. reduction of the Observations made in Christiania in 1827, and at Makerstoun in 1829 

 and 1830 : and, that its magnetism has not yet become stationary will also appear by com- 

 paring the log. reduction of the Observations made at the different stations to No. I. For 

 which reason, I have not connected the Observations by the Flat Needle with those of Cy- 

 linder, No. I. 



The following Table will show the log. reduction of the Flat Needle to Cylinder, No. I. 

 at the different stations where Observations have been made with both needles : 



LOG. REDUCTION OF THE FLAT NEEDLE TO CYLINDER, NO. I. 



Christiania, June 1827, ..... 



C December and January 18289, 

 Makerstoun, -? June 1829, 



^January and February 1830, 



Fort-George, 



Tain, . 



Dornoch, 



Thurso, 



Tongue, 



Inverness, 



Fort- William, 



Inverary, 



Sanquhar, . ^. 



Annan, 



Carlisle, 



Berwick, 



Log. Reduction. 



0-0882541 



0-0934693 



0-0954164 



0-1020146 



0-1032437 



0-1062819 



0-1054496 



0-1062040 



0-1066942 



0-1051618 



0-1065578 



0-1067781 



0-1073058 



0-1066836 



0-1077152 



0-1080591 



0-1076942 



0-1085912 



