Description
Technical Manual Reprint (TM 9-1240-239-35) for M28C/T46 Periscope Sight August 1960
This Technical Manual Reprint TM 9-1240-239-35 covers the M28C/T46 Periscope Sight and is dated August 1960.
The publication is a field- and depot-maintenance reference for the armored-vehicle direct-fire sight, and this reprint incorporates the current pages from Changes 1 and 2.
Historical Significance
The M28C belonged to the postwar generation of compact periscopic sights developed for commanders and gunners operating turret- and cupola-mounted weapons from under armor. Its optical path allowed the operator to observe and aim while remaining inside the protected vehicle position.
The sight served across several Cold War armored-vehicle families, including the M48 and M60 series tanks, M67 flame-thrower tanks, and XM706/M706 armored cars. It was also used with the T50 (Aust) turret installed on Australian M113A1 armored personnel carriers.
Armored-Vehicle and Weapon-System Applications
The M28C is a monocular direct-fire sight designed for vehicle-mounted weapons. Mechanical linkage between the sight and weapon mounting keeps the line of sight aligned as the weapon is elevated, while the optical reticle provides aiming and range-reference information.
On U.S. tank installations, the M28C supported the commander's cupola machine-gun station on vehicles such as the M48A2C, M48A3, M60, and M60A1. Related applications included the M67A1 and M67A2 flame-thrower tanks and the turret system used on the XM706 and M706 light armored cars.
What This Manual Covers
This field- and depot-maintenance manual addresses inspection, troubleshooting, repair, rebuilding, and adjustment of the M28C/T46 Periscope Sight. It provides the technical depth required beyond routine operator care for diagnosing faults and restoring the sight to serviceable standards.
The maintenance sequence includes removal and disassembly, inspection of components, assembly and installation, and final tests and adjustments. It also identifies the parts, tools, and equipment required for field- and depot-level work.
Because this copy is a reprint incorporating the current pages from Changes 1 and 2, the issued corrections and replacement pages are integrated into the publication rather than supplied only as separate change sheets.
Key Features
- Official publication number: TM 9-1240-239-35
- Publication date: August 1960
- Equipment covered: M28C/T46 Periscope Sight
- National Stock Number: 1240-00-706-0794
- Publication format: reprint incorporating current pages from Changes 1 and 2
- Maintenance scope: field and depot inspection, troubleshooting, repair, rebuilding, testing, and adjustment
- Equipment function: armored-vehicle direct-fire optical sighting
Why This Manual Matters
TM 9-1240-239-35 documents the Army maintenance practices used to keep an important armored-vehicle fire-control optic in service. Its procedures help identify how the sight was disassembled, inspected, repaired, aligned, and tested at higher maintenance levels.
The incorporated change pages make this reprint especially useful as a consolidated working reference for restoration projects and historical research involving M28C-equipped vehicles and weapon stations.
About This Manual
Published by the Headquarters, Department of the Army in August 1960, TM 9-1240-239-35 is a field- and depot-maintenance manual for the M28C/T46 Periscope Sight.
This copy is specifically identified as a reprint containing the current pages from Changes 1 and 2. It is a maintenance manual rather than a repair-parts-only catalog.
Ideal For
This manual is a strong fit for:
- U.S. Army technical-manual collectors
- M48, M60, and M67 tank restoration projects
- XM706 and M706 armored-car researchers
- M113A1 T50 turret restorers and historians
- Military optics and fire-control researchers
- Museums, archives, and reference libraries
Approx length 8", Approx width 10", Approx height .4", Approx weight .6lbs.
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