Technical Drawing - Exam Papers - Higher - 1995 - Building

Question 5

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On a contour map A and B are two points whose altitudes are 85 m and 110 m, respectively. On the map B is located 70 m north of A. A skew bore-hole at A is drilled in a south-westerly direction in plan and has an actual inclination of 55° to the horizontal plane. It reveals the top and bottom surfaces of a stratum at altitudes of 60 m and 40 m, respectively.

A skew bore-hole at B 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 the stratum at altitudes of 90 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 southerly direction in plan. The length of the hole as it goes through the stratum is 45 m. Determine the altitude at which the bore-hole reaches the top surface of the stratum.

Scale 1: 1000

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