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By A.B. Emary

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Extra resources for A Comprehensive Practical Geometry for Builders

Example text

Figure 143 shows the plan and elevation of two mouldings, A and B, meeting at an obtuse angle. Moulding A is level and B is inclined at 30°. The shape of moulding A is given. In this case it is best to draw the plan in the position shown so that the elevation of the mitre can be constructed. 1. 2. 3. Draw the plan of the two mouldings and the elevation of A and also that of the mitre, making 0, 1, 2, 3 in the plan equal to those in the elevation of A. Project the points in the plan over to the mitre and upwards to meet those projected over from the section in the elevation.

Iii - - - " ' - - - - - '7 workshop method 2 C Figure 99 The plasterer's method Figure 1 00 shows how a plasterer, with the aid of an axis board and a trammel, can form an elliptical plaster moulding. \ ........... -- / .... - \ I I I ~/ / aL---------~~~------~b workshop method I Figure 98 USE OF THE TRAMMEL plasterer's use of trammel Figure 100 The next method, also suitable for use in workshops, is called the trammel method and requires a length of lath, or similar material, at least as long as half the length of the major axis.

Make the points 0, 1,2,3 equal those on moulding A and drop lines from these points to enable the section of moulding B to be constructed. B s~ung round to Of----'----*+K- _ ~h~ ~o_=i~o~"1 ~ I I I A 21--------+1 31----------z given moulding open mitre Figure 144 B Raking mouldings 1. 2. 3. 4. 5. 6. 7. Draw the plan of mouldings A and B in the position shown. Swing moulding B round so that it is in line with moulding A. This will give the position of the open mitre. Draw the elevation of moulding A and make the points 0, 1, 2, 3 in the plan equal those in the section.