IWA 0984 Thyssenstahl steel carrier beams slide rule chart 1962 Germany

This dedicated slide rule chart was developed specially for calculation on steel carrier beams, as produced by ATH aka Thyssenstahl Company. It was produced by IWA with number 0984 in 1962. It has an interesting design with 2 slides, one for the quick selection with widows, the other a genuine slide rule with slider for quick calculation. The original blueish sleeve also has the Thyssenstahl name on it. Instructions are on the rule itself. The slide rule is in good condition with small signs of use only. It measures ca 28 cm or ca. 11 1/4 inches long. Check the attached video on how to work your vintage man tool: slide rule operation instructions!