meters. If precision is desired, use tables II and III providing corrections for altitude and latitude for values from table I.
31.
Table II, Altitude Correction
Table II provides corrections for altitude above or below altimeter readings of 450 meters. These values are to be
added to values from table I. For example, assume the mean altitude reading is
1,100 + 900 = 1,000 meters.
2
Find intersection of 1,000 meters and wet bulb 60 F., interpolate between lines, giving about + 0.0007. Add this value to
value obtained from table I, 1.063 + 0.0007 = 1.0637. Corrected altitude difference-(1,100-900) (1.0637) = 212.74 meters.
22.
Table III, Latitude Correction
Table III provides corrections for latitudes north or south of the equator. The values taken from the latitude
correction table will be added to the values from tables I and II when operating at other than 450 latitude. For example, at
800 latitude the correction from the latitude table is approximately 0.0014.
Value obtained from table I = 1.063
Correction from table II
= 0.0007
Correction from table III
= 0.0014
Corrected altitude, difference
= (1,100-900)
(1.0651) = 213.08 meters.
47
