# Technical Drawing - Exam Papers - Higher - 1999 - Building

### Question 5

On a contour map A and B are two points whose altitudes are 90 m and 100 m respectively. On the map A is located 65 m south of B. A skew bore-hole at A is drilled in a south-westerly direction in plan and has an actual inclination of 60° to the horizontal. It reveals the top and bottom surfaces of a stratum at altitudes of 60 m and 30 m, respectively.

A skew bore-hole at B is drilled in a south-easterly direction in plan and has an actual inclination of 40° to the horizontal plane. It reveals the top and bottom surfaces of the stratum at altitudes of 80 m and 10 m, respectively.

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

(b) Another skew bore-hole at A is drilled in a westerly direction in plan and it reaches the bottom surface of the stratum at a distance of 60 m from A. Determine the altitude at which the bore-hole reaches the top surface of the stratum and also find its true inclination to the stratum.

Scale 1: 1000

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