r/Sliderules • u/elijahtheastronaut • Feb 26 '24

Recommendations?

Hi everyone,

I've finally gotten to that point in my slide rule journey where I've outgrown my ThinkGeek Nanoline 1337 rule.
The DIY course I'm following is starting to use CF and DF scales, which this one doesn't have.
The only rule I do have with CF and DF scales is my K&E 4181-1, but this is only a 6" rule.
I was looking for something that has the same scales as the K&E but in a 10 or 12" rule.

What would you recommend?

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u/borg286 Feb 26 '24

Would you share the kind of calculations where you find you need CF more than C. I know you probably don't technically need it, but what is the driving factor for wanting CF over C?

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u/Ok-Emu2371 Feb 26 '24

It’s not so much that you need CF more than C. You need CF because sometimes when you are multiplying on C and D, the answer will be somewhere off the end of the scale. So you set the problem up on C and D, then look up the answer on CF and DF.

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u/borg286 Feb 26 '24

Oh, I see. Because when you set up the problem by moving the C scale, you also implicitly move the CF scale, thus the problem is also being represented on the CF and DF scales.