TM 5-6675-323-14
h = Difference in elevation between datum plane and first point
in feet.
=
Differential
parallax
used
for
first
determination.
1
= Difference in elevation between datum and second point.
h
= Differential parallax for second point measured in mill-
imeters.
Example (1) :
( 1 ) Check distance between datum and point to be measured. (Must be between
8-1/2 in. and 4-1/2 in.)
(2) Make datum plane reading (paragraph 10-6.2c). Micrometer reads 3.38 mm.
10-12
