TM 75053
ML247( )
Figure 51. Theodolite ML247( ).
EL 750953TM51
6. TECHNICAL CHARACTERISTICS:
1. NOMENCLATURE: Theodolite ML247( ).
Tracking telescope:
2. TYPE CLASSIFICATION: Standard A.
Type _ _ _ _ _ _ _ _ _ _ Right angle, with prism.
Magnification_ _ _ _ _ 19-24 power (approx).
3. SECURITY REQUIREMENTS: Unclassified.
Field of view _ _ _ _ _ _ 2 (approx).
Eyepiece _ _ _ _ _ Inverting, adjustable with
4. PRIMARY USE OR CONCEPT OF EMPLOYMENT:
crosshairs.
Used to follow and measure the movement of pilot
Focus _ _ _ _ _ _ _ _ _ Adjustable.
balloons.
Finder telescope:
5. BRIEF FUNCTIONAL DESCRIPTION:
Magnification _ _ _ _ _ 3.75 to 5 power.
Field of view _ _ _ _ _ _ 10 (approx), in combi-
Theodolite ML247 ( ) is a portable, right-angle, tele-
nation with eyepiece of
scope-type surveying instrument particularly adaptable
main telescope.
for the observation of balloons. The ML247( ) is used
Azimuth scale _ _ _ _ _ _ _ 360 range, calibration 0.1.
to visually track a weather balloon in flight. The instru-
Elevation scale _ _ _ _ _ _ _ 240 range, calibration 0.1.
ment follows and measures the movement of a pilot balloon
as it is carried through the atmosphere by the airflow.
Sights:
vertical
Extension _ _ _ _ _ _ For
sighting
The azimuth and elevation of the balloon are read from
angles to 85.
the scales on Theodolite ML247( ) at regular intervals
vertical
sighting
Fixed _ _ _ _ _ _ _ _ _ For
from which computations are made to determine the speed
angles 45.
and direction of the wind at various heights. Theodolite
Illumination _ _ _ _ _ _ 3 incandescent lamp as-
ML247( ) consists mainly of the theodolite, base plate,
semblies.
and carrying case, and is usually mounted on Tripod
Power requirements. - 3 vdc (two l-v batteries)
ML78 or MT1309/GM.
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