Jean_LAMESCH_Sliderules_Collection_BOX

1770_TROEGER_circular

The largest circular sliderule in the collection: Diameter 290mm. Corpus is a thin plywood disc of 4mm thickness, covered by black paper. The inner 2 scales may be rotated. The scales are printed on beige-tinted paper with a thin lacquer protection. Made by the German company K. Emil TRÖGER from Mylau-Vogt1and (later DDR). Model 1R, possibly produced in 1928 but may be newer. Tröger made his sliderules up to the middle of the 1960's. This sliderule does not fit in box JL10.