104 Rev. Mr Scoresby on the Uniform Permeability of 



TABLE of the Results obtained when the exact length of the Bar was 

 made the integer of distance. 



Table of Results with three feet Bar-magnet, when tJie distance between- 

 ihefod was assumed to be 2 feet 3 inches. 



• The distance of the magnet from the compass at the first length, it 

 will be observed, is three inches less than the assumed focal length. This ap- 

 parent difference arises from the measurements of distance being taken as 

 the interval between the centre of the compass and the nearest extremity of 

 the magnet, instead of the nearest focus of attraction in the magnet lying 

 three inches within the extremity. 



