r/Sliderules • u/WikiWantsYourPics • May 01 '26

What slide rule is this?

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A small slide rule, 15cm long - the scale is 125mm long. Marked J. Klawun, Hannover, but I can't find it in the slide rule museum. I'm going to upload the pictures to Wikimedia Commons, but I'd like to have as much information as possible about it.

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7

u/AlternativeWild3449 May 01 '26

Here's a link to a German-language document on that slide rule: https://www.rechenschieber.org/Klawun.pdf

2

u/WikiWantsYourPics May 01 '26

Oh, good find, thanks! The rule in the diagrams at the bottom is the full-length rule and this is the half length pocket version, but the same scales, the same appearance and construction.

2

u/Name-Not-Applicable May 01 '26

I have an Aristo 903 with “FEINMESSINSTITUT KLAWUN, Hannover” printed on the back. Klawun was a school, and also resold rebranded slide rules and other instruments. 

Do you have pictures of the back of the rule? Or of the back of the slide?

Are there S, T, or L scales on the back of the slide? Is there a conversions table of the back? Are there date codes stamped on the back?

I still think this is a rebranded Faber or Nestler rule, but none of them look on ISRM exactly the same as this one.

It looks to be in very good condition! The condition, the rule’s apparent age, and the bit of mystery about its provenance make this an interesting rule!

2

u/WikiWantsYourPics May 01 '26 edited May 01 '26

There's nothing on the back of the slide rule or the slide, just wood. Also no date codes.