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Hanno,

Based on the Atlas description it can perform to 5 places. Looking closer at the scales has me thinking 4 places. The outer scale of the Atlas gives results to 2 or 3 places and is used to aid in selecting the correct spiral. A project on the horizon will be to fit an 8 inch print of your scales onto the face of a basic 8 inch circular slide rule for trials.

G

From: Hanno Ix
Date: 2015 Feb 22, 19:46 -0800

Hello,
 

this ATLAS seems in many ways more complex but also more powerful.
 

My goal has been creating a Circular Slide Rule capable of  just 4 - digit multiplications/divisions usable for CelNav and designed such that it can be build by a dedicated hobbyist with good but modest tools.
 

I cannot make out from the picture if ATLAS's long scale is a spiral but the text in Greg's link appears to be saying so. My SCALE1 may be used as described there, I believe. My color schemes, though, are additional tools for estimating more quickly on which turns of the spiral the factors and the result may be found. I suppose the yellow background of some turns on the ATLAS is meant for the same purpose -  I would like to know more about that. Without such a tool it takes quite long to locate the numbers. Perhaps you can find a particular clever method - better than ATLAS or me.
 

I owe you still a detailed description of using my designs - I ask you for  your patience, though. However, I can see from your notes you might already be researching your own ideas of using them. Great!
 

H