(2) Example: Assume that the indicated pressure is 810 millibars
and the temperature 20 F. The temperature correction at 40 F. is
0.2 mb. The temperature correction at 0 F. is 0.7 mb. Interpolating
between these two values, the true correction would be 0.45 mb. Since
the barometer is read to the nearest tenth of a millibar, the correction
to be used is 0.4 mb, making the corrected pressure 810.4 mb.
d. Correction in inches. Temperature corrections are given only in
millibars. Corrections apply to both scales, however. In order to obtain
the corresponding corrections in inches, multiply the millibar correc-
tion by 0.02954.
DIFFERENCES IN ELEVATION. a. Method. Barometer ML-102-E may
be used either alone or with another precision barometer to determine
the difference in elevation between two points by comparing the dif-
ference in pressure. Since humidity is a factor to be considered, the
use of a thermometer or a psychrometer is required. This method also
requires the use of a nomograph which is attached to the back of the
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