I am not sure if this is it but here is part of it:

Octagon table or eight-square scale

This tale on the square is usually located along the middle of the tongue
face and is used for laying off lines to cut an eight- square or
octagon-shaped piece of timber form a square timber. In Fig. 2o, let abcd
represent the end section, or but, of a square of 6" x 6" timber. Through
the center the lines ab and cd parallel with the sides and at right angles
to each other. With dividers take as many squares (6) from the scale as
there are inches in width of the piece of timber, and lay off this square on
either side of the point a, such as Aa and Ah; lay off in the same way the
same spaces from point b, as Bd and Be; also lay off Cb, Cc, Df,and Dg.
Then draw the lines ab, cd, ef, and gh. Cut off the edges to lines ab, cd,
ef, and gh, thus obtaining the octagon or 8-sided piece

It makes perfect since with the pictures in the book, but sounds wierd here.




"Topaz" wrote in message
...
Thanks for your replies everyone.
Many reactions refer to the current Octagon scales - showing how to
"plane" a 4-side to an 8-side (eg the wiki).
My OP said that was not what I wanted: what I want is
the Eagle square from about 1900 to 1923 (when Eagle were swallowed
by Stanley) which had a different set of scales as my OP described.

Sweet Sawdust, before we start posting, please can you be really sure
that
the copy you have describes the old Octagon scales ?

(I have put a scan of the scales on Flickr but I dont know how to post
a link to
the single image here. Help anyone?)

Greetings.

On 22 jun, 16:07, "sweet sawdust" wrote:
"Topaz" wrote in message

...



This is an appeal to rec.ww's.
Does anyone have a copy of the Audel publication Carpenters and
Builders Library Book #1, containing information on Framing Squares?
It must be a about a 1923 print, or reprint thereof.

There is an ongoing discussion on some roof framing forums about how
to use the Octagon table. Not the table on a modern square, used to
turn a square-sided post into an eight-sided one. The Eagle square
made in those days had a set of scales to set out the angles of
rafters for an octagon roof; one of those scales appears to be "wrong"
- but it can't be !

It would be great if someone has a copy and is prepared to post how
the hip side cut (octagon) scale should be interpreted.

Topaz

Yes it is on page 264 book 1 of the 4th edtion copy right 1976 . Where do
you want it posted



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