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National Geographic NG770A, Instruction Manual, Page: 9 / 12

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National Geographic NG770A Instruction Manual Download Page 9

(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; therefore, 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 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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Summary of Contents for NG770A

Page 1: ...WATCH COLLECTION NG770A NG771A NG771C INSTRUCTION MANUAL ...

Page 2: ......

Page 3: ...the crown out to the time setting position 2 2 Turn the crown to set the hour and minute hands to the desired time 3 Push the crown back to the normal position 1 SETTING THE DATE 1 Pull the crown out to position 2 2 Turn the crown counterclockwise until the previous day s date appears 3 Push back the crown to the normal position 1 1 Normal position Second hand 1 ...

Page 4: ...his scale cannot place a decimal point therefore the calculation of this watch should be used as a guide only 1 Time Required Example Obtain the time required for the flight of an aircraft at 180 knots for 450 nautical miles Operation Align 18 on the outer scale with the SPEED INDEX on the inner scale Then 45 on the outer scale corresponds to 150 1 on the inner scale time scale Thus the time requi...

Page 5: ...ns hour when the flight time is 30 minutes and the fuel consumption is 130 gallons Operation Align 13 on the outer scale with 30 on the inner scale Then the SPEED INDEX on the inner scale corresponds to 26 on the outer scale Thus the fuel consumption is 260 gallons an hour 2 Knots Air Speed Example Obtain the knots air speed for 240 nautical miles with a flight time of 1 hour and 20 minutes Operat...

Page 6: ...escent time Example Obtain the difference in altitude when an aircraft continues descending for 20 minutes at a rate of 430 feet a minute Operation Align 43 on the outer scale with 10 on the inner scale Then 20 on the inner scale corresponds to 86 on the outer scale Thus the difference in altitude is 8 600 feet 5 Fuel Consumption Example Obtain the fuel consumption required for a flight when the f...

Page 7: ... 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 ...

Page 8: ...tained 12 Division Example 900 47 Operation Align 90 on the outer scale with 47 on the inner scale Then 10 on the inner scale corresponds to 19 1 on the outer scale Take into account the position of the decimal point to obtain 19 1 10 Conversion Example Convert 45 statute miles into nautical miles and kilometers Operation Align 45 on the inner scale with STAT on the outer scale Then NAUT on the ou...

Page 9: ...o Euro The exchange rate is 1 4 CHF to 1 Euro therefore 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 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 t...

Page 10: ...y battery type Titanium lithium ion Secondary battery size 9 5 mm x 2 1 mm Working time Approx 6 months after fully charged Charging time Approx 3 hours under 100 KLX sunlight Approx 120 hours under 1000 LX fluorescent lamp Operating temperature range 5 C to 50 C Water resistance 10 ATM 100 m 8 ...

Page 11: ......

Page 12: ... 2008 National Geographic Society NATIONAL GEOGRAPHIC and Yellow Border Design are trademarks of the National Geographic Society All rights reserved ...

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