Technical Drawing - Exam Papers - Higher - 1994 - Building

Question 5

(a) On a contour map A and B are two points whose altitudes are 110 m and 90 m, respectively.
On the map B is located 95 m north-east of A. A skew bore-hole at A is drilled in a westerly 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 distances of 50 m and 75 m, respectively from A.

A skew bore-hole at B 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 the stratum at distances of 15 m and 90 m, respectively from B.

Determine the dip, strike and thickness of the stratum.

(b) Draw the projections of another skew bore-hole drilled at an angle of 70° to the horizontal Plane from A and which reaches the bottom surface-of the stratum at a distance of 100 m from A.

Scale 1 : 1000