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How to measure a target’s size (height and width) using azimuth readings (both models)
According to the formula for distance measurement, you can calculate the height using: H = D x w. When measuring the size,
you rst estimate the distance to the target, then measure the azimuth or upper and lower angle. With these measurements, you
can calculate the height of the target using the formula.
For example: the distance is 0.6km between the observer and the target. You can measure that the azimuth is 60 (0-60) and the
upper and lower angle is 30 (0-30). So, using the formula you can get:
The height: H=0.6 x 30=18m
The width: h=0.6 x 60=36m
How to measure distance directly using the reticle in ( Fig. 6) NOTE: Model 280751 ONLY
For example, if the target is 2 meters in height, place the lower part of the target at the horizontal line on the reticle with the
upper top part of the target against the angled scale line. The reading on the top of the target, where the top of the target or image
touches the top of the angled scale line, is the distance between the target and the observer.(line value: 100m) As shown in Fig.
6, the distance between the target and the observer is 550m.
How to use the compass NOTE: Model 280750 ONLY
The azimuth angle can be also measured through the compass built into the right half of the body . It shows the azimuth of
the object vis-à-vis the observer. Each graduation of the compass equals one degree of angle. When the object lies in the north
from you, the compass shows 0°.And it will increase when you turn clockwise. 90°means the object lies in the east from you,
180°means the south and 270°means the west.
In order to insure precise angle measurements, the binoculars should be kept horizontal and level when reading the compass.
The object should lie in the middle of the reticle.
The graduations of the compass need to be illuminated for convenient viewing when there is not sufcient daylight to illuminate
the compass dial. (Do not use the battery operated internal illuminating system when the outside viewing conditions are bright
enough to see the compass dial and marking clearly.)
Fig. 6
Fig. 7