Technical Drawing - Exam Papers - Higher - 2007 - Building

Question 5

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(a) On a contour map, A and B are two points with altitudes of 105m and 95m respectively.
On the map, A is located 65m north of B. A skew bore-hole at A is drilled in a south-westerly direction in plan and has an actual inclination of 40° to the horizontal plane.
lt reveals the top and bottom surfaces of a stratum at altitudes of 85m and 15m, 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 65m and 35m, respectively.
Determine the dip, strike and thickness of the stratum.

(b) On a separate map, R and S are two points on the upper surface of a stratum which are joined with a straight line. R has an altitude of 60m. On the map, S is located 90m north-east of R.
The stratum has a strike of north 70° east and has a dip of 40° in a general south-easterly direction.
Find the altitude of point S and determine the true angle between the line RS and the strike line.

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