Slide Rule

I have a Dietzgen Maniphase Multiplex, the part number is a "1732".

Scales A and B are the same. They go from 1 to 100.

Scales C and D are the same, they go from 1 to 10. Note the decimal markings. They can be used with the CF (C folded) and DF scales. For x*y, where the product would be off the scale on D, line up C1 with x on D, then find y on CF and it will be lined up with the answer on DF. The CF and DF scales are multiplied by pi, so just lining up the cursor on D with x will give you π*x on DF.

The S scale is sine.