Jean_LAMESCH_Sliderules_Collection_NBX_JL

1744c_GUNTER_Scale

1744c_GUNTER_Scale

Close up on the upper scale in inches, running from 1" to 23" (the lenght of the rule is 2 feet, 610mm). More information here. An excellent presentation by Otto E. van Poelje "Gunter Skalen in der Praxis" is here. Two videos by Ian Petrie here.