This dedicated slide rule chart was developed specially for calculation surrounding pipes. It calculates pressure and viscosity by various temperatures as well as different with and length and thickness with using diagrams and specific scales. Developed as a universal tool for the German industry. It was produced by IWA with number 06096 around 1980. It has the more modern and sturdy IWA design with plastic frame and cursor in said frame. It measures ca 32 cm or ca. 13 inches long and is in good shape with small signs of use and age only. Check the attached video on how to work your vintage man tool: slide rule operation instructions!
