System Sacher IWA 15302 traffic accident slide rule 1960 Austria Germany

This circular slide rule comes in the original sleeve and with its manual in German. This model is called the system Sacher and it was made produced by IWA under number 15302. It is large, measuring ca. 21 x 21 cm or 8 1/4 x 8 1/4 inches. It has a unique construction with a single triangular cursor and 2 rounded lines on the different discs (3 in total). It was specially designed to calculate the circumstances surrounding traffic accidents like speed, distance but also the distance glass fragments travel from the collision and brake track length. Made in Germany for Austria in the 1960’s and everything is in good condition,  the slide rule is fully functioning. One side of the largest disc has a flater side which is probably broken off, but also makes for easier setting of the discs (reflected in the price). The sleeve measures 22 x 22 cm or 9 x 9 inches and has 2 pouches to store the disc and manual separately. Also check out the DAT traffic accident slide chart b by IWA under number 11048. Check the attached video on how to work your vintage man tool : slide rule operation instructions!