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will be — 7o; therefore, the true heading will be 340°—70=333° true.

h. Exercises.—Find heading and air speed, given scheduled ground speed, course, wind speed, and wind direction:

(1) GS=185, C=110°, WS=35, WD=172° (2) GS=232, C=351°, WS=47, WD=33°

AS=269, H=358° Answer. (3) GS=129, C=186°, WS=38, WD=243°

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(4) GS=189, C= 27°, WS=42, WD=165°

AS=160, H=37° Answer. (5) GS=165, C=223°, WS=21, WD=267° (6) GS=215, C=271°, WS=48, WD=316°

AS=252, H=279° Answer. APPENDIX I MISCELLANEOUS UNITS AND CONVERSION FACTORS

1. Formulas.
a. Area of circle, radius=r, is are(n=3.1416).
6. Area of rectangle, width=w, and length=l, is wl.
c. Area of triangle, base=b, and altitude=h, is bh/2.
d. Volume of sphere, radius=r, is %s ar3 (n=3.1416).
e. Volume of prism, area of base=A, height=h, is Ah.
2. Conversion factors.
66 nautical miles =76 statute miles=122 kilometers

(approximate)
1 centimeter (cm.) =0.393700 inch (in.)
1 foot (ft.)

=12 inches (in.)

=30.4801 centimeters (cm.) 1 inch (in.)

=2.54001 centimeters (cm.)
1 kilometer (km.) =1,000 meters (m.)

=0.62137 statute mile (mile, stat.)
=0.53959 nautical mile (mile, naut.)

=3280.83 feet (ft.)
1 meter (m.)

=100 centimeters (cm.)
=1,000 millimeters (mm.)
=3.28083 feet (ft.)

=39.3700 inches (in.)
1 millimeter (mm.) =0.039370 inch (in.)
1 nautical mile (naut.) =6,080.20 feet (ft.)

=1.151553 statute miles (miles, stat.)

=1.853249 kilometers (km.)
1 statute mile

=5,280 feet (ft.)
=1.60935 kilometers (km.)

=.868393 nautical mile
1 U. S. gallon (gal.) =231 cubic inches (cu. in.)

=.13368 cubic.foot (cu. ft.)

=.83310 British gallon
1 cubic foot (cu. ft.) =1,728 cubic inches (cu. in.)

=7.4805 United States gallons (gal.)
1 kilometer per hour=0.62137 statute mile per hour
(km./hr.)

=0.53959 knot 1 knot

=1 nautical mile per hour

=1.853249 km./hr.

=1.151553 mph. or miles/hr.
1 statute mile per hour=1.4666 feet per second
(mph. or mile/hr.) =1.60935 km./hr.

=0.868393 knot 3. Temperature scales.

Freezing: 0° C.=32° F. =273° K. (Absolute)
Boiling: 100° C.=212° F.=373° K. (Absolute)

Co=5(Fo—32).
Fo=%C° +32.

Ko=C°+273. 4. Time equivalents.

GMT

-London

Cairo

100 MIDNIGHT

Next day

06m

New York (EVTI

"0300 Chicago (CUT)

Denver (MWT) 6-1800 San Francisco (PWT) +

< 1500 0900

MIDDAY

— Tokyo

FIGURE 150.

NOTE.—Time given for Tokyo is standard time. Difference in standard time between New York and Tokyo is 14 hours.

5. Densities.

Gasoline (aviation) weighs 45 lb./cu. ft. or 6 lb./gal.
Oil (aviation) weighs 56 lb./cu. ft. or 7.5 lb./gal.
Water weighs 62.4 lb./cu. ft. or 8.34 lb./gal.
Air (dry) weighs .0765 lb./cu. ft. at 15° C. (59° F.) and standard

atmospheric pressure.

APPENDIX II
TABLES OF LOGARITHMS AND TRIGONOMETRIC

FUNCTIONS
Table I.-Common logarithms

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