DEVELOPMENT OF STADIA RANGE FINDER, T45
PITTSBURGH UNIV PA
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Accuracy in range estimation plays so important a part in obtaining first-round hits in antitank fire that a number of new types of infantry range finder were put into development in the postwar period. Because of its small size, light weight, and simple design, the stadia type has been given particular consideration. The idea of developing a stadia range finder for infantry use was suggested by a study made by APG of the rangefinding mechanism of the USAF Type K3 caliber .50 automatic computing sight. An adaptation of this Air Force device was made and in November 1950 was sent to AFF Board No. 3 for evaluation. The Board prepared a list of military characteristics for the item and in April 1951 Ordnance opened a subproject for the development of a stadia range finder, designated the T45, as part of a general project for the development of infantry range finders that had been active since 1946. The T45 stadia range finder can be used in conjunction with short-range infantry weapons to measure ranges to targets with one dimension within the spread from 4 to 30 feet. Such targets can be at any distance between 100 and 2,000 yards from the range finder. When using the instrument, either one dimension of the target must be known or it must be possible to estimate it quite accurately. An error in estimation of this dimension will result in a range error of the same proportion.
- Target Direction, Range and Position Finding