572 



FOURTH REPORT — 1834. 



Account of some Experiments on the Electricity of the Copper 

 Vein in Htiel Jewel Mine. By Robert W. Fox. 



The author transmitted a section of the deepest part of the 

 mine, with a description of the manner in which he conducted 

 the experiments on its electricity. 



Huel Jewel. Deepest workings on South or Main Lode, which 



underlies about 2o° towards the North. 

 Black and vitreous Copper in the Vein, with some yellow Sulphuret intermixed. 



Wesl. 



8B fathoms from { 

 th« surface. 



83 fathoinf, '•.' 



Vitreous BS Copper. 



Direction of Eleclricily from the Vein. 

 Positive. Negative. Distance. 



Scale offathomi. 



19 fathoms. 

 37 ditto. 

 34 ditto. 

 23 ditto. 



The vein consists of black and vitreous copper above, and 

 below, the yellow sulphuret of copper. Their boundaries are 

 shown by the dotted lines. 



