# A Comprehensive Practical Geometry for Builders by A.B. Emary

By A.B. Emary

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**Example text**

Divide d - 6 into the same number of parts as was the centre line a - b, in this case, six. Project vertical lines from the points on the semi-circle upwards to the horizontal lines along the length of the column. 1 and l' will meet at 1 ", 2 and 2' will give 2", etc. These points will give the outline of the entasis. 14. ROMAN AND GRECIAN MOULDINGS BASIC ROMAN MOULDINGS GRECIAN MOULDINGS The drawings (figures 108 - 114) represent the seven basic Roman mouldings and can be drawn with a compass.

Draw h - i parallel to a - b some distance away and extend f - g to give i on h - i. , extending the lines as shown. With radius f - g and centres 1, 2, 3 ... in turn, describe the arcs to cut the extended lines at points 1 ", 2", 3" etc. Join these points to produce the entasis. The second method can be seen in figure 107(b): 4' 4 4" 1. 2. 3" 3. • 4. 5. I" h a c (a) d c a d (b) 36 Draw the centre line of the column a - b and divide this into, say, six equal parts. Draw horizontal lines through these points.

A Figure 80 To inscribe four circles in a square, each circle to touch one side of the square (figure 81): 1. 2. 3. 4. Figure 82 Construct the square and its diagonals. Draw a vertical and a horizontal line through the intersection of the diagonals to divide the figure into four triangles with their centre lines. Take the lower of the triangles, bisect angle b - a - c to give point 0 on the centre line. This is the centre for the circle in this triangle. With centre c and radius c - 0 mark the centres for the other circles.