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Originally Posted by derstosstrupp
Ausdampfverfahren and Auswanderungsverfahren - glad to see these being used! I’d love to have a high quality slide rule like that. Where did you get yours?
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It's from a Japanese company called Concise. You can find them on the internet. As far as I could tell they're the only company selling circular slide rules.
They have a few different models. I ordered a few from them. The one shown in the picture is model no. 300. This one is the most suitable for the calculations you have to make. They cost about $30 each plus you have to pay shipping cost as they are send from Japan.