Technical Drawing - Exam Papers - Higher - 1998 - Building
On a contour map A and B are two points whose altitudes are 125 m and 90 m respectively. On the map B is located 70 m south of A. A skew bore-hole at A is drilled in a south-easterly direction in plan and has an actual inclination of 50° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at altitudes of 80 m and 15 m, respectively.
A skew bore-hole at B is drilled in a southerly direction in plan and has an actual inclination of 70° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at altitudes of 60 m and 30 m, respectively.
(a) Determine the dip, strike and thickness of the stratum.
(b) Another skew bore-hole at B is drilled in a northerly direction in plan and has a true inclination of 50° to the bore-hole already drilled at B. Determine the length of this bore-hole as it passes through the stratum.
Scale 1: 1000