Luftwaffe Dreieckrechner DR2 Flight computer

In addition to mechanical and electrical radio directional navigation aids the Luftwaffe also utilized two different models of manual flight navigation devices which were basically circular slide rulers to assist in navigation calculations. These were referred to by flight crew as 'Knemeyer' and this example is in good issued condition is a Dreieckrechner DR 2 made by DENNERT & PAPE in Hamburg, Germany on April 1941. It also comes with a little provenance as we bought direct from the family of the original owner in Germany. Measures 6" diameter (15 cm)