Jean_LAMESCH_Sliderules_Collection_BOX_JL10

1753_UNIQUE_Dualistic_159mm

1753_UNIQUE_Dualistic_159mm

UNIQUE Dualistic mahogany simplex British pocket sliderule (look at the "high speed" inscription!). On the slider the middle two C scales represent the 2 parts of one scale splitted at pi. Age probably ~1952. On the frame, the D scales are also splitted. The well (not shown here) has a table of the decimal equivalents of 24 fractions of 16 or 32. Cardboard case.