286 
MR. A. W. RUCKER AND DR. T. E. THORPE ON A MAGNETIC 
it must be due to the greater complications introduced by the interference of local 
with regional disturbances. 
Fig. 19. 
Disturbing Horizontal Magnetic Forces in South-Eastern England. 
The maps which have been used to illustrate our discussion of the Reading disturb 
ance give indications of other minor centres, and in particular the isogonals are 
considerably distorted in the north. It appears that if we draw a line through 
King’s Lynn (No. 100), Spalding (No. 140), Melton Mowbray (No. 116), Lough¬ 
borough (No. 109), Birmingham (No. 63), and Malvern (No. 112), the district through 
which it passes is the seat of local disturbances, which, though individually less wide¬ 
spread than that already discussed, are nevertheless of considerable intensity. 
We will now investigate several points in this neighbourhood. It will not be 
necessary to do this in the same detail as before. The places to be considered lie so 
near to the borders of the district already studied, that methods which are so consis¬ 
tent in the one cannot be subject to any important error in the other. 
The Wash. 
We have discovered a, remarkable disturbance in the neighbourhood of the Wash. 
No more unlikely region eowld. primd facie have been suggested, but the evidence for 
its existence is conclusive. 
