Technical Drawing - Exam Papers - Higher - 2005 - Building

Question 5

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On a contour map A and B are two points whose altitudes are 115m and 95m respectively.
On the map B is located 105m south-east of A. A skew bore-hole at A is drilled in a southerly direction in plan and has an actual inclination of 45° to the horizontal plane.
It reveals the top and bottom surfaces of a stratum at distances of 20m and 95m, respectively, from A.

A skew bore-hole at B 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 the stratum at distances of 55m and 80m, respectively, from B.

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

(b) Another skew bore-hole at B is drilled in a northerly direction in plan. lt reveals the bottom surface of the stratum at a distance of 70m from B. Detemine the altitude at which the bore-hole reaches the top surface of the stratum.

(c) Determine the true angle between the two bore-holes drilled at B,

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