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January 19th, 2016, 09:32 AM   #1
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"Best" circular slide rule?

Hello.
I've recently developed a strong interest in slide rules and discovered that circular ones are made. I am looking into buying one but am unsure which one to get.

So: what is the best one?

This is ofcourse a very stupid question. More specifically, I'm looking for one that can do the most and be the most precise. I need trig, indices, surds (if that is possible), and multiplication and division obviously. I'm also interested in the smallest resolution that is reasonable, better than 2 or 3 d.p. at least.

Does anyone have any recommendations for such devices and where I can find them? I'm not too bothered about price but what sort of fortune am I looking at for this type of device?

Also as a side question: What are the regs on slide rules in GCSE exams? *wink wink*
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January 21st, 2016, 03:34 AM   #2
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I have found one called the Halden Calculex and this is the idea but I can't find a modern remake of it unfortunately
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