# Technical Drawing - Exam Papers - Higher - 1996 - Building

### Question 5

On a contour map A and B are two points whose altitudes are 100 m and 110 m, respectively. On the map B is located 80 m south-east of A. A skew bore-hole at A is drilled in a south-easterly direction in plan and has an actual inclination of 60° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at distances of 35 m and 100 m, respectively, from A.

A skew bore-hole at B is drilled in a north-easterly direction in plan and has an actual inclination of 50° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at distances of 45 m and 95 m, respectively, from B.

(a) Determine the dip, strike and thickness of the stratum.

(b) Another skew borehole at A is drilled in an easterly direction in plan and meets the top surface of the stratum at a distance 35 m from A.

Determine the altitude at which this bore-hole reaches the bottom surface of the stratum.

Scale 1: 1000