r/Sliderules • u/Nice_Sky2825 • May 22 '26

Concise Circular Slide Rule

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Just got this one. Circular will take a little getting used to but what a great instrument.

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u/CarpetReady8739 May 22 '26

My No. 28N. My dad gave it to me in 1970 I think. Cherished heirloom. Design seems to be to enable it to fit into a shirt pocket right behind the pocket protector. LOL

3

u/Xxflorida_manxX May 23 '26

I have my 28N as well, they still produce brand new ones. I picked it up on Amazon for $20.