Description
Technical Manual (TM 9-1240-275-34) for Telescope Mount T206 January 1963
This U.S. Army Technical Manual TM 9-1240-275-34 covers field maintenance of the Telescope Mount T206. The publication is dated January 1963.
The T206 was the development designation for the telescope mount later standardized as the M146 Telescope Mount, P/N 8616011 and NSN 1240-00-864-0348. It supported the elbow telescope used as the gunner’s direct-fire sight on the 105 mm M108 and 155 mm M109 self-propelled howitzers.
Historical Significance
The M108 and M109 were developed together as a new generation of enclosed, tracked self-propelled artillery. The M108 carried a 105 mm howitzer, while the M109 carried a 155 mm howitzer. Both vehicles used related fire-control equipment for aiming and laying the weapon.
Dated January 1963, this manual records the telescope mount while it still carried the T206 test-series designation. Later Army publications identified the standardized mount as the M146. The M108 had a short U.S. service life, but the M109 became a long-serving self-propelled howitzer family.
T206 Mount and Its Howitzer Applications
The T206 mount was paired with the T176E3 elbow telescope, which was standardized as the M118-series elbow telescope. Together, the mount and telescope formed the gunner’s direct-fire sighting assembly.
The mount supported the telescope and allowed precise adjustment of its optical line of sight. Its controls provided elevation and deflection corrections for boresighting and weapon alignment. The system also included cross-level or cant correction so the gunner could maintain proper sight alignment when the vehicle was not level.
The mount was associated with these original end items:
- 105mm M108 Self-Propelled Light Howitzer
- 155mm M109 Self-Propelled Medium Howitzer
The standardized M146 mount remained part of later M109-family fire-control equipment. Later configurations supported the M118A2 and M118A3 Elbow Telescopes and supplied vehicle power for sight illumination.
What This Manual Covers
This publication provides field-maintenance information for the T206 Telescope Mount. Its technical coverage supports inspection, troubleshooting, disassembly, repair, reassembly, adjustment, and testing of the mount and its operating mechanisms.
The manual concentrates on the telescope mount. It is not the complete vehicle manual for the M108 or M109, and it does not replace the separate maintenance manual for the elbow telescope.
Key Features
- Official publication number TM 9-1240-275-34
- Covers the Telescope Mount T206
- Dated January 1963
- Field-maintenance technical reference
- Documents the mount later standardized as the M146
- Associated with the T176E3/M118-series Elbow Telescope
- End item applications include the M108 and M109 self-propelled howitzers
- Covers a mount used in the gunner’s direct-fire sighting system
Why This Manual Matters
This manual documents the transition from the T206 development designation to the standardized M146 Telescope Mount. It also explains how a specialized optical mount fit into the fire-control systems of the early M108 and M109 self-propelled howitzers.
It is a useful reference for identifying surviving mounts, studying artillery sighting equipment, researching M108 and M109 fire-control systems, and comparing development-era components with later standardized models.
About This Manual
This is a U.S. Army field-maintenance technical manual identified as TM 9-1240-275-34. It covers the Telescope Mount T206 and is dated January 1963. It is a maintenance manual rather than a repair-parts-only publication.
Ideal For
- U.S. Army technical-manual collectors
- M108 and M109 howitzer researchers
- Military optics and fire-control collectors
- Self-propelled artillery restoration projects
- Cold War military-equipment collections
- Military vehicle and artillery historians
- Reference and technical libraries
Approx length 8", Approx width 10", Approx height .2", Approx weight .2lbs.
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