Description
Technical Manual (TM 9-1240-260-35) for M31/T50 Periscope June 1960
This Technical Manual TM 9-1240-260-35 covers the M31/T50 tank periscope and is dated June 1960. It is a field and depot maintenance publication for the optical instrument used by the tank gunner for observation and main-armament aiming.
The manual supports higher-echelon maintenance of a specialized fire-control component rather than operator-level instruction or a repair-parts catalog.
Historical Significance
The M31 was part of the primary fire-control equipment used on major U.S. tanks of the early Cold War period. Its optical arrangement gave the gunner a magnified aiming channel with a reticle for laying the main armament and a unity-power channel for general observation.
Official equipment references associate the M31 periscope with the 105 mm gun tanks M60 and M60A1 and the 90 mm gun tank M48A3, placing this manual within the development and sustainment history of American armored fire-control systems.
M31 Periscope and Tank Fire Control
The M31/T50 served as the gunner's periscope within a tank's primary fire-control system. Its 8-power aiming channel supported precise main-gun laying, while the unity-power viewing channel provided a wider observational view.
For researchers and restorers, the publication connects the optical instrument itself with the maintenance organization responsible for keeping tank fire-control equipment serviceable.
What This Manual Covers
TM 9-1240-260-35 provides field and depot maintenance guidance for the M31/T50 periscope. Its maintenance-level designation identifies it as a technical reference for personnel performing work beyond routine operator and organizational maintenance.
The publication is focused on maintenance of the periscope as an optical fire-control instrument. It is distinct from an operator's manual and from a parts-only publication.
Key Features
- Publication: Technical Manual TM 9-1240-260-35
- Publication date: June 1960
- Equipment: M31/T50 tank periscope
- Maintenance level: Field and depot maintenance
- Equipment function: Gunner's observation and main-armament aiming periscope
- Associated tanks: M60, M60A1, and M48A3
Why This Manual Matters
Maintenance publications for fire-control optics preserve technical context that general vehicle manuals often cannot provide. This manual is a focused reference for understanding the support of the M31/T50 periscope and its place in U.S. tank gunnery systems.
It is useful for identifying the correct maintenance publication, interpreting period equipment documentation, and supporting historically grounded research on M48A3 and M60-series fire-control equipment.
About This Manual
This is Technical Manual TM 9-1240-260-35, dated June 1960, for field and depot maintenance of the M31/T50 Periscope. It documents a gunner's optical fire-control instrument associated with the M48A3, M60, and M60A1 tanks.
Ideal For
This technical manual is a strong fit for:
- U.S. military technical-manual collectors
- M48A3, M60, and M60A1 researchers and restorers
- Tank fire-control and optical-instrument historians
- Museum and reference-library collections
- Cold War armored-vehicle documentation collections
Approx length 8", Approx width 10", Approx height .35", Approx weight .5lbs.
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