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Measuring the elevation angle
(vertical angle) with the vertical
scale reading on the MIL crosshairs
The elevation angle measures the angle between the
horizontal zero line, beginning at the starting point
of the observer and extending towards the observed
object, and the height of a defined point on the
observed object (in the illustration e.g. the base of the
lighthouse on the horizontal zero line and the top of
the lighthouse as defined point). If the elevation angle
is within the range of the vertical scale of 8 MIL, you
must first align the vertical scale in the crosshairs at
the foot of the lighthouse to "0". The elevation angle
of the lighthouse in the illustrated example can now be
read off directly as 6.7 MIL, wherein 1 MIL corresponds
to 1/1000 inch. If the elevation angle of the observed
object lies outside of the vertical scale of 8 MIL, to
determine the elevation angle you must simply proceed
in steps and add up the individually determined values.
Example for calculating the height of the
object
It is a prerequisite to know the distance. This is 1,194
meters in our example. The scale value read from the
reticle plate is 6.7.
24
This is then calculated as follows:
1,194 meters x 6.7 divided by 100, resulting in an
object height of 80 meters.
4
4
3
3
2
2
Height of observed object (m) =
Distance (m) x elevation angle
Length of observed object (m) =
Distance (m) x azimuth angle
Elevation angle = Vertical angle
Azimuth angle = Horizontal angle
8
8
7
7
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6
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4
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3
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2
1
1
1
1
2
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3
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4
100
100
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