70 MR. W. H. BARLOW ON THE SPONTANEOUS ELECTRICAL CURRENTS 
the earth at Normanton as usual. The deflections continued as before on the circuit 
from Derby to Normanton, and Manchester to Normanton, but disappeared on the 
Derby to Manchester circuit, these places lying nearly in the line of “ no-action,” as 
determined by your experiments. 
I find the line from London to Derby but slightly affected, and that from Norman- 
ton to Leeds is almost entirely free. 
I am, my dear Sir, yours very truly, 
{Signed) R. S. Gulley. 
W. H. Barlow, Esq., Derby. 
