Description
Technical Manual TM 9-1220-207-35 for M14 (T33) Ballistics Computer, April 1961
This Technical Manual TM 9-1220-207-35 covers the M14 (T33) Ballistics Computer and is dated April 1961.
The publication provides field- and depot-maintenance guidance for the mechanical fire-control computer used with the M103A1 120 mm gun tank.
Historical Significance
The M14 represented the mechanical fire-control technology used in the M103A1 heavy tank during the early Cold War. It formed part of the sighting and fire-control system for the 120 mm Gun Tank M103A1.
The computer worked with the tank's rangefinder, sights, and elevation system to convert range and correction inputs into the superelevation needed for the 120 mm gun. This reduced the manual work required to apply ballistic corrections before firing.
What This Manual Covers
TM 9-1220-207-35 addresses field and depot maintenance of the M14 (T33) Ballistics Computer. It is intended for technical personnel responsible for servicing, adjusting, troubleshooting, repairing, and rebuilding the computer beyond the operator level.
The documented computer accepted range data from the M15 stereoscopic rangefinder. Its ammunition selector used ballistic cams for different ammunition types, while the range-correction controls compensated for factors affecting gun and ammunition performance. The computer then produced and transmitted the required superelevation value through the tank's fire-control system.
Key Features
- Official publication number: TM 9-1220-207-35
- Equipment covered: M14 (T33) Ballistics Computer
- Publication date: April 1961
- Maintenance scope: field and depot maintenance
- Vehicle application: 120 mm Gun Tank M103A1
- Fire-control role: calculated and transmitted superelevation for the main gun
Why This Manual Matters
This publication documents the higher-level maintenance practices used to support a specialized mechanical fire-control computer. It preserves official terminology and service information for an important part of the M103A1 fire-control system.
It also gives researchers and restoration teams a focused technical reference for understanding how range, ammunition selection, ballistic corrections, and gun elevation were linked in the tank.
About This Manual
Published by the Department of the Army in April 1961, TM 9-1220-207-35 is the field- and depot-maintenance manual for the M14 (T33) Ballistics Computer. Its maintenance scope is above operator and organizational service.
Ideal For
This manual is a strong fit for:
- U.S. Army technical-manual collectors
- M103A1 tank researchers and restoration teams
- Military fire-control system specialists
- Military museums and reference libraries
- Historians studying Cold War armored-vehicle technology
Approx length 8", Approx width 10", Approx height .5", Approx weight 1lbs.
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