AND LEICESTEESHIRE AND THEIR RELATIONS TO GEOLOGICAL STRUCTURE. 79 
B to be well on the top of the bed, C to be entirely off the bed, and D to be on the 
continuation of the bed on the south side of the valley. 
The accompanying geological map (Plate Ap. l) shows the positions of the stations 
and their “ relative” disturbing forces. The horizontal disturbance is shown in mag¬ 
nitude and direction by an arrow drawn from the station, the scale being I cm. = lOy. 
The vertical disturbance is shown by a number at the station, -|- for a downward 
elfect, — for an upward. 
The relative disturbances are by no means great, but the most pronounced features 
are the comparatively large upward disturbance at E, and the horizontal disturbance 
towards the south at B. 
The mean disturbance common to the five stations does not directly concern us, but 
it is to be noted that it is in close agreement with the disturbance obtained in the 
general survey for the district, of which Northamptonshire forms a part. 
Disturbing Forces. 
— 
North. 
West. 
Vertical. 
Irthlingboi’ough, A . . . . 
- 56 
+ 19 
- 34 
B . . . . 
-78 
+ 30 
- 62 
C . . . . 
-30 
+ 12 
- 45 
D . . . . 
-24 
+ 20 
- 73 
E . . . . 
-24 
+ 5 
- 109 
Mean disturbing force . . 
-42 
+ 17 
- 65 
(A - sign for a disturbance to North or West denotes that the disturbance is South or East 
respectively.) 
Subtracting the mean in each case, the relative disturbing forces are :— 
— 
North. 
West. 
Vertical. 
A. 
- 14 
+ 2 
+ 31 
B. 
-36 
+ 13 
+ 3 
C. 
+ 12 
- 5 
+ 20 
D. 
+ 18 
+ 3 
- 8 
E. 
+ 18 
- 12 
-44 
The results are discussed in a later section (p. 87). 
(2) We pass now to the Leicestershire Series. The positions of the observation 
stations and the “ relative ” disturbing forces are indicated on the coloured geological 
map (Plate Ap. 3), the arrows showing the direction of horizontal disturbance being 
drawn to a scale of 1 cm. = 40y. 
