Technical Drawing - Exam Papers - Higher - 1996 - Building

Question 4

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Fig. 4 shows a pictorial view of a shell structure. Also shown are the outline elevation, and end elevation of the structure. The true shape of the vertical section S-S is the parabola ACB (dotted line). The surface is generated, as shown, by moving a straight line element parallel to the surfaces BDE and AGF, so that it is always in contact with the line EF and the parabola ACB.

(a) Draw the given elevation and end elevatIon and project a plan.

(b) Determine the true shape of the curve AHB.

Scale 1: 500

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