Description
Technical Manual (TM 9-1240-218-35P) for M13/T45E1 and M13A1/T46E4 Range Finders September 1958
This Technical Manual TM 9-1240-218-35P covers the M13/T45E1 and M13A1/T46E4 Range Finders and is dated September 1958.
The publication is a field- and depot-maintenance repair-parts and special-tools list for stereoscopic range finders used in the fire-control systems of early M48-series 90 mm gun tanks.
Historical Significance
The M13 and M13A1 range finders represent the mechanical and optical fire-control technology used in the first generations of the M48 Patton. Before laser range finding became standard, these turret-mounted stereoscopic instruments allowed the crew to determine target distance through optical comparison.
Range data from the instrument was passed into the tank's mechanical fire-control system. The ballistic computer used that input to calculate superelevation, while the ballistic drive coordinated the range finder, gunner's sight, and 90 mm main gun.
M48-Series Tank Applications
The M13/T45E1 range finder was associated with the M48, M48A1, and M48C 90 mm gun tanks. The updated M13A1/T46E4 was used with the M48A2 and M48A2C.
On the M48A2, the M13A1 worked with the M13A1 ballistic computer, M5A1 ballistic drive, and M20A3 gunner's periscope. The range finder measured target distance, and the connected fire-control components used that information to adjust the weapon and sighting system for the selected range.
What This Manual Covers
This -35P publication identifies repair parts and special tools required for field- and depot-level support of the M13 and M13A1 Range Finders. It provides the official parts nomenclature and supply relationships needed to identify, requisition, and organize components for maintenance.
The manual distinguishes the standardized M13 and M13A1 designations from their earlier development names, T45E1 and T46E4. That cross-reference is valuable when matching parts records, drawings, maintenance references, and vehicle documentation from the 1950s.
Key Features
- Official publication number: TM 9-1240-218-35P
- Publication date: September 1958
- Equipment covered: M13/T45E1 and M13A1/T46E4 Range Finders
- Publication type: field and depot repair parts and special tools list
- Vehicle context: M48-series 90 mm gun tanks
- Technical role: stereoscopic target ranging for the tank fire-control system
Why This Manual Matters
This publication documents the parts-support structure behind a major component of the early M48-series fire-control system. It helps researchers connect range-finder assemblies and subassemblies with the Army nomenclature used by field and depot maintenance personnel.
The inclusion of both standardized and development designations also makes the manual useful for interpreting period technical records that may identify the same equipment under different names.
About This Manual
Published by Headquarters, Department of the Army, in September 1958, TM 9-1240-218-35P is a parts and special-tools reference for the M13 and M13A1 Range Finders.
As a -35P parts publication, its focus is parts identification and maintenance supply support rather than complete operating instructions or full repair procedures.
Ideal For
This manual is a strong fit for:
- U.S. Army technical-manual collectors
- M48 Patton restoration and research projects
- Military fire-control and optical-instrument researchers
- Armored-vehicle museums and reference libraries
- Historians studying 1950s tank gunnery systems
Approx length 8", Approx width 10", Approx height .1", Approx weight .2lbs.
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