at 1, 2, 3, 4, etc. Join up these points and the octagon will be described.

Second Method.—Let the width be known. Construct a square to the given width and draw two diagonals. Mark off from centre C, along each diagonal half, the width of the required octagon. Through these points draw lines parallel to the diagonals, so constructing a second square overlapping the first, which will produce an octagon as shown.

The bevels shown on the left octagon are those used for marking the templets, and are placed there for convenience; they can easily be identified by the letters. A is the bevel for the cap joint No. 4, B the bevel for the shaft joints Nos. 1 and 2 (see Fig. 9 for further identification).

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