Emil Tröger 1R MIB wood circular slide rule full set 1930 Germany

An early interesting wooden model slide rule by K. Emil Tröger from Germany. This lightweight nr. 1 round slide is a special edition with 2 cursors. The rule also comes complete with the original box as well as the rare manual(s). All in like new condition with minimal signs of use and age. The slide rule is also marked Mylau /Vogtl but does not show patent numbers yet. The 2 revolving discs (adjustable via the large black knob on the back were used for calculating percentages in an office. It is complete and working. It measures 30 cm or 12 inches in diameter. The manual has 4 large pages. Check the attached video on how to work your vintage man tool : slide rule operation instructions! Do also check the smaller nr. 2 here.