Thanks @dwardio for the design! I made mine in non-PG white oak ply, and gave it an oil/wax finish.
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I barely ever won a battle with a standard slide rule, don’t even want to think how badly I would come out against a round one.
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Glad you like it – the oak looks great!
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That looks great!
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This is cool. It sparked an idea that I don’t know if it has any merit.
Could you make something like this with power and speed on it as a guide of how to step up or down
I am sure it’s not that simple or useful. But if you don’t share the idea you may never know.
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My dad always used a slide ruler. I never understood it. But I love the design!
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Yeah, I keep meaning to google how these work but as I say, it is pretty far down on my list.
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A slide rule uses a logarithm scale to multiply and divide. They are shown as the C and D scales. To multiply, the value of the C scale is added to that of the D scale. The tricky part is keeping up with the numbers of zeros or where to put the decimal point. It uses what is called scientific notation. 
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To be honest, I don’t really know how to use it, yet. This is what I’m used to:
A circular[ish] slide[ing] rule[r].
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I have a pattern for the time/speed/distance rings of the E6B flight computer shown. PM me if you’re interested.
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Happy Cakeday @kelley1! 
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I made one of these for me and one for my son. It is allowing me to see math in a different way. It is totally cool! Thanks so much for the great design @dwardio !
Here is a short & simple tutorial I found to get you started
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Cool!
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I heard Charlie Brown’s teacher.
And there was a time in my life I really understood math.
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Thanks for the tutorial. I’ve bookmarked it.
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Looks great!
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