To multiply, first position the end of the C slide over one of the multiplicands on the D slide. Then position the reticule over the other multiplicand on the C slide. Read the result off of the D slide.
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To multiply, you use the log slides, C and D. (Addition in log scale is the same as multiplication in linear space.) First position the end of the C slide over one of the multiplicands on the D slide. Then position the reticule over the other multiplicand on the C slide. Read the result off of the D slide.