NDLI: Firing table computations on the Eniac

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Firing table computations on the Eniac

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Firing table computations on the Eniac

Content Provider	ACM Digital Library
Author	Reed, Harry L.
Abstract	One of the major missions of the Computing Laboratory of the Ballistic Research Laboratories is the computation of firing tables to allow new weapons to be put to use and to supplement changes in existing weapons. Having been originally designed with this mission in mind, the Eniac still has 25 per cent of its computing computing time devoted to artillery and bomb ballistics computation. While the consideration of bomb ballistics introduces some concepts not encountered in firing table work, much of the computation is similar to that performed in the preparation of a firing table, and therefore, although this paper considers the latter, much can be carried over to the computation of bombing tables.The computation of firing tables on the Eniac is of interest for three reasons. First the problem represents the type in which full, but not overtaxing use is made of the twenty high speed registers available on the Eniac and as such typifies problems which can be economically handled on a machine with this limitation. Second, in adapting the problem to this limitation, many methods have been tried, and the experience gained could easily be applied to putting much larger problems on larger machines. Third, the problem of obtaining a realistic solution requires a close union of physical observation, mathematical theory, and human judgement.The preparation of a firing table is accomplished in three phases. The first phase is the reduction of empirical data to parameters which may be used in a mathematical model, simple enough to allow numerical computations to be made on the Eniac. The second phase consists of the computation of trajectories with this model for both nominal (or normal) conditions and for various perturbations of the nominal conditions. The third phase involves high order interpolations on the data obtained from the second phase into information usable in the field.
Starting Page	103
Ending Page	106
Page Count	4
File Format	PDF
DOI	10.1145/609784.609796
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1952-05-02
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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