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r/Sliderules

Image 1 — Any other Soviet sliderules
Image 2 — Any other Soviet sliderules
🔥 Hot ▲ 51 r/Sliderules

Any other Soviet sliderules

Here’s my little collection of Soviet era SR’s.

Oldest is from 1936.

Any other out there?

u/onceuponatimeiwasa — 23 hours ago
🔥 Hot ▲ 51 r/Sliderules

What am I looking at?

cheers calculators,

I was given a slide rule that I cannot identify. I have it from an engineer who worked at the german railroad company way back when.

there is no serial number or any other marking on the slide rule, the leather enclosure or the red cardboard box.

any idea what this thing is?

best regards

UPDATE:

I am looking at a:

Charvoz-Roos Log Log SR-??? (Model Number Unknown) - c1945

Made in USA - Celluloid laminate over wood, plastic braces. Cursor style same as Acumath 150, but with a thicker stock.

Note: Because there is no model number it was probably intended for rebranding for another company.

Front Scale: LL0, LL00, A [ B, K, L, C ] LL3, LL2, LL1

Back Scale: T, DF [ CF, CIF, CI, C ] D, S Cos, ST

thanks to u/Name-Not-Applicable

shoutout to sliderulemuseum.com

u/MeikelKappes — 1 day ago
▲ 27 r/Sliderules

DIY Thermal Engineer Slide Rule

Hello everyone,

I recently started a very small project of creating a slide rule used to calculate only one thing, the Nusselt number based on the famous Dittus-Boelter (Nu = 0.023 * Re^0.8 * Pr^n) heat transfer correlation for turbulent flow used by many engineers when designing heat exchangers, piping, ...

I used Claude to create the Python code that generates SVG for each slider.

Combined slide rule

To manufacture it, as I saw in one of the post in this subreddit, I plan to use PCB with KiCad to create the slide rule.
What others components, do I need to design in order to make that slide rule works?

If you want, I could share the code to everyone in a dedicated Github?

What do you think about it? I am completely new to the slide rule world, so any tip to improve it would be greatly appreciated.

Have a good day,

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u/AlarmedForm630 — 10 days ago