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The cotan scale goes through two cycles so that you do not run off the edge of 
the scale as commonly happens with slide rules.

gl
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On Mon, 6/16/14, Hanno Ix  wrote:

 Subject: [NavList] Re: Flat Bygrave alternative configuration
 To: garylapook@pacbell.net
 Date: Monday, June 16, 2014, 12:41 PM
 
 HI,
 Robin:Please remind me why your alternate scales are
 of different width?Since the scales are slanted I
 suppose they are meantto create helixes (
 'helices'? ) on on cylinders with different
 diameters, right?This would be one
 explanation.�I would like to use them in
 G.Pook's "flat" mode.The slant is not
 much of a problem - a little annoying,
 though.However, the underlying log() scale on which
 the scales are based must strictlybe of the same
 scale for my purpose, no?Am I missing something
 here?�Hanno��
 
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