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M138 Elbow Telescope
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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EQUIPMENT DATA -820360036
TM 9-1240-375-34&P
0002 00
M138A1 Elbow Telescope
2
3
4
6
1
5
M 138A 1
1 fc 0 1 6
1.
Optical Instrument Latch Set (1). The optical instrument latch set is attached to the eyepiece end of
the M138A1 telescope. The optical instrument latch set is used for mounting the telescope to the
M172/M172A1 mount.
2.
Eyepiece Cell Assembly (2). The eyepiece cell assembly is inside the diopter adapter assembly, which
is attached to the telescope. The eyepiece cell assembly consists of a series of lenses and spacers.
3.
Reticle Cell Assembly (3). The reticle cell assembly is inside the rear of the diopter adapter assembly.
The reticle cell assembly consists of an optical element cell and battery powered LEDs for reticle
illumination.
4.
Objective Cell Assembly (4). The objective cell assembly is located inside the optical instrument
housing. The objective cell assembly consists of an optical element cell and an optical instrument lens.
An optical instrument eyeshield is attached to the diopter adapter assembly.
5.
Battery Enclosure Assembly (5). The battery enclosure is located on the telescope. It is used to hold
the battery.
6.
Eye Piece Extension (6). The M138A1 telescope is equipped with an eye piece extension for use on the
M777 lightweight howitzer.
EQUIPMENT DATA
US CUSTOMARY
METRIC
M17 Fire Control Quadrant
Correction .........................................................................................
95 mils
Depression ........................................................................................
-280 mils
Elevation ...........................................................................................
+1433 mils
Least increment reading (counters) ................................................
1 mil
Radioactive material:
Max surface radiation ................................................................
0 millirad per hour
Tritium H3 ...................................................................................
1.86 curies
Weight ...............................................................................................
7.5 lb
3.40 kg
0002 00-13

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