Swiss Military Manual page 15

Division
1. Set the number you are dividing by on the inner scale over the number you
are dividing on the outer scale. (e.g., for 540 ÷ 12 = 45, set the 12 on the
inner scale over 54 on the outer scale.)
2. Read the result on the outer scale opposite the (10/arrow) number on the
inner scale.
Ratios and Conversions
When the numbers on the outer scale and the inner scale match, the ratio
between the two scales is 1:1. When you rotate the inner scale so that the
number (10/arrow) is opposite the 20 on the outer scale, the ratio between
the two scales is 2:1. This feature is useful to convert any linear conversion
like currencies or weight/length from standard to metric. Simply find how
many units of one measurement equals one unit of the other and match up
that number with the number (10/arrow).
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