National Geographic NG770A, Инструкция по эксплуатации

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(8) Rate of Climb (or Descent)
The rate of climb (or descent) can be obtained from the time
required to reach an altitude.
Example: Obtain the rate of climb when an aircraft reaches an
altitude of 7,500 feet after climbing for 25 minutes.
Operation: Align "75" on the outer scale with "25" on the inner
scale. Then, "10" on the inner scale corresponds to "30" on the
outer scale. Thus, the rate of climb is 300 feet a minute.
(9) Time of Climb (or Descent)
The time required for climb can be obtained from the altitude to be
reached and the rate of climb (or descent).
Example: Obtain the time of climb when an aircraft is to climb to
6,300 feet at a rate of 390 feet a minute.
Operation: Align "39" on the outer scale with "10" on the inner
scale. Then, "63" on the outer scale corresponds to "16" on the
inner scale. Thus, the time of climb is 16 minutes.
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