The computation of the possible maximum deviation of the 
Table IT. 
ty at the surface of the ei 
rpsiilts so obtained have 
"Possible Maximum Gravity Versus Latitude Curve." 
Figure 1 gives the Free -Air Gravity, the Bouguer Gravity, 
and the Possible Minimum and Maximum Gravity Curves. The Free-Air 
Gravity Curves, computed for +5,000 and +10,000 meter altitudes, rep- 
resent the values of gravity at various latitudes referred to the Normal 
Spheroid minus free air corrections. The Bouguer Gravity Curves, 
computed for -5,000 meter and -10,000 meter oceanic depths, represent 
ty 
Bougue 
Gravity 
the Free Air Gravity 
maximum possible 
for regional, isostatic and daily variation corrections. The Maximum 
Gravity Curve represents the sum of the Bouguer Gravity plus 0.3 of s 
gal. 
Figure 1 shows that 
)Ove sea level the maximum pi 
cannot exceed 8.56 eals.. that 
gals., where 983.22 is the value of gravity at the pole at sea level ana 
974.66 is the value of gravity at the equator at +10,000 meter altitude. 
Examples - Assume that an area is located at 75 degre 
latitude with the mean altitude equal to 4,000 meters. According to 
Figure 1 its Free Air Gravity will be equal to 981.80 gals., approxi 
mately, and the possible Maximum Gravity will be (981.80 + 0.3) ga 
or 982.10 gals., approximately. 
An area located in the Himalaya Mountains, and whc 
tude is 25 degrees and the mean altitude is equal to 7,500 meter 
have the Free-Air Gravity in the area equal to 976.65 gals., and 
possible Minimum Gravity equal to (976.65 - 0.3) gals., or 976, 
approximately. 
The author would like to express his thanks 
Sprang of the Geology Department, Missouri School of N 
Metallurgy, U. of Missouri. Rolla. Mo., for his helpful s 
A.C. 
6 
