# Technical Drawing - Exam Papers - Higher - 1997 - Building

### Question 5

On a contour map A and B are two points whose altitudes are 125 m and 130 m, respectively. On the map B is located 125 m east of A. A skew bore-hole at A is drilled in a north-easterly direction in plan and has an actual inclination of 65° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at altitudes of 105 m and 40 m, respectively.

A skew bore-hole at B is drilled in a south-westerly 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 altitudes of 85 m and 70 m, respectively.

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

(b) Another skew bore-hole at B is drilled in a south-easterly direction in plan. The length of the hole as it goes through the stratum is 30 m. Determine the inclination of this bore-hole to the horizontal plane and find the distance from B to the top surface of the stratum along the bore-hole.

Scale 1: 1000