Emil Tröger early wooden circular slide rule full set 1930 Germany

An early interesting wooden model slide rule by K. Emil Tröger from Germany. This light weight nr. 1 round slide rule comes complete with the original plastic sleeve as well as the rare manual. All in very good condition with minimal signs of use and age. The slide rule is also marked Mylau /Vogtl and with the number 37/393/6004 as well as the patent number D.R.G.M. 227046. The 2 revolving discs (adjustable via the large black knob on the back were used for calculating percentages in an office. This is an early model without curser. It is complete and working. It measures 14,5 cm or 5 3/4 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!