National Geographic NG770B, Инструкция по эксплуатации

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(14) Square Root
Example: Square root of 900
Operation: Turn the outer scale slowly and find a value that
corresponds to both 90 on the inner scale and 10 on the outer
scale. In this example, "90" on the inner scale corresponds to "30"
on the outer scale and "10" on the outer scale corresponds to "30"
on the inner scale, thus the answer is 30.
(15) Currency Operation
Example: Convert 35 Swiss Franc (CHF) into Euro. The exchange
rate is 1.4 CHF to 1 Euro, thereby 14 CHF converts to 10 Euro.
Operation: Align "14" on the outer scale with "10" on the inner
scale. Then, "35" on the outer scale corresponds to "25" on the
inner scale. Thirty-five CHF is the equivalent to 25 Euro. All values
on the inner scale correspond with the outer scale; CHF to EUR
(or other currency).
(13) Proportion
Example: 30/10 = 60/x
Operation: Align "30" on the outer scale with "10" on the inner
scale. Then, "60" on the outer scale corresponds to "20" on the
inner scale. At this point the proportion for every value and the
inner and outer scales is 30:10.
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