Layout of 8 and 16 sides on a tapered spar stave
Bevel square set at 45° to obtain 8 sides
(Resulting points "A" are 8-sided corners.)
Width of timber squared across
(Inscribed circle is girth of spar at that place.)
Boxed circles are drawn to the limit of the squared stave's width. These provide points "A" through which the edges of the 8 sides may be faired with a batten.
Bevel square set to 671/2° to obtain the sides
(Resulting points "B" are 16-side corners.)
Layout of the circle to 8 and 16 sides at the butt provides a continuing pattern in the event marks along the sides are planed off.
(Marked for 8 sides)
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