away 18 fathoms towards the north, and also that the tin vein was 18 fathoms further north between the western and the middle cross vein than between the latter and the eastern cross vein. The workings to the east of the latter are not exhibited in the longitudinal section, in consequence of its being another mine called Old Huel Peever.
By the longitudinal section it will be seen that the downward direction of the eastern cross vein x, towards the west, was 4 inches in a fathom, the underlie of that 17 fathoms on the west of it at the surface at y, was towards the west one foot and a half in a fathom. The underlie of the cross course at the western extremity of the mine z, was in opposition to the latter, being very little towards the east, though nearly perpendicular.
c c, d d, Represent the north and south slides intersecting the tin vein, the former at 25 fathoms perpendicular from the surface at the engine shaft, and the latter about 50 fathoms below. 9, shews the situation of the shallow adit or water course, and 10, the deep adit; all the other horizontal lines represent the passages or levels made by the miner in the search after tin, or for the convenience of his occupation. The dark parts of the longitudinal section shew the places in which tin was found.
Pl. 7, fig. 3.
