Determining Square Root
[Example]
Square root of 169
[Operation]
Turn the outer scale slowly and find a value that corresponds to both
16.9 on the outer scale and 10 on the inner scale.
In this example, 16.9 on the outer scale corresponds to 13 on
the inner scale, and 10 on the inner scale corresponds to 13
on the outer scale. Thus, the answer is 13.
Time required
[Example]
Obtain the time required for the flight of an aircraft at 160 knots for 240
nautical miles.
[Operation]
Align 16 on the outer scale with the SPEED INDEX (MPH) on the inner scale.
Then, 24 on the outer scale corresponds to "1:30" on the inner scale (time
scale).
Thus, the time required for the flight is 1 hours and 30 minutes.
Speed
[Example]
Obtain the knots (air speed) for 250 nautical miles with a flight time of
1 hour and 40 minutes.
[Operation]
Align 25 on the outer scale with "1:40" on the inner scale (time scale).
Then, the SPEED INDEX (MPH) on the inner scale corresponds to 15 on the
outer scale. Thus, the air speed for the flight is 150 knots.
97