AND CORNWALL, AND THEIR MECHANICAL ORIGIN. 
Direction of Caunter Lodes (A" '?). 
407 
No. 
Bearing. 
Lode. 
Mine. 
1 
16 S. of E. 
Barncoose. 
Carn Brea. 
2 
22 „ „ 
Vigors’ Caunter. 
„ „ 
3 
39 „ „ 
Caunter. 
Dolcoath. 
4 
40 „ „ 
Caunter. 
N. Roskear. 
Cross Course, conjugate to the Caunters. 
(C") 20° E. of N, in Carn Brea. 
The following Systems may be regarded as fully established in Cornwall: — 
I. Primary System. 
(A) Joints . . 6° 23' N. of E. (Mag.)* =30° 20' N. of E. 
Lodes . . 8° 45' „ „ =34° 45' „ 
II. Conjugate of Primary. 
(C) Joints . . 9° 4' W. of N. (Mag.) =33° 4'W. ofN. 
Cross Courses 6° 40' „ „ =32° 40' ,, 
The following System exists also, but is not so prominent. 
III. Secondary System. 
(A") Joints and Cross Courses 20° 0' S. of E. (Mag.) =4° N. of E. 
IV. ' Conjugate of Secondary. 
(C") Joints ... 18° O' E. of N. (Mag.) 6° W. of N. 
Caunter Lodes 19° O' „ „ 7° „ 
The angles between the Primary and Secondary Systems are as follows : — 
Between Primary and Conjugate of Secondary, 
(A — A") 
(C-C") 
(Joints . . . 
(Lodes . . . 
| Joints . . . 
(Cross Courses . 
26° 23' 
30° 45' 
27° 4' 
25° 40' 
Mean 
27° 28' 
* I have assumed the mean variation in Cornwall to be 24° W. in 1860, and to have been 26° W. in the 
year 1840. 
3 i 
MDCCCLXIV. 
