TM-9-1290-262-24-P
AIMING CIRCLE, M2A2, W/E
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT,AND GENERAL SUPPORT MAINTENANCE MANUAL
SEPTEMBER 1994
TM-9-1290-262-24-P - Page 14 of 192
ARMY TM 9-1290-262-24&P
MARINE CORPS TM 00476C-24&P
AIR FORCE TO 49A7-3-72/74
d.
e.
f.
g.
1-9.
Cover. The aluminum dome is provided with two cover latches and a webbed carving strap.
Plumb Bob. Consists of a pointed cylindrical weight with a nylon string and slide adjuster.
Canvas Cover. Contains pockets for storing the instrument light, plumb bob, and lamp extractor.
Lamp Extractor. Consists of a metal tube with a rubber cap at each end.
EQUIPMENT DATA. Refer to TM 9-1290-262-10.
Section Ill. PRINCIPLES OF OPERATION
1-10. AIMING CIRCLE WITH EQUIPMENT.
A portable instrument used to measure elevation
and azimuth angles. With the aid of a filter, the aiming circle can be used to shoot the sun.
a. AIMING CIRCLE. Secured on the head of the tripod with the instrument fixing screw. Three
baseplate screws and two tube levels are used to level the aiming circle. The elbow telescope when
slewed in azimuth or elevation provides angle readings on the mil scales or on the reticle.
b.
c.
d.
e.
f.
1-4
TRIPOD. Provides a flat, stable platform for the aiming circle.
M51 INSTRUMENT LIGHT. Provides light to operate the aiming circle at night.
COVER. Protects the aiming circle when not in use.
CANVAS COVER. When attached to the tripod, serves as a cover for two lamp extractors,
instrument light M51, and plumb bob.
LAMP EXTRACTOR. Used to remove or install the lamps in the M51 instrument light.
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