Reliability functions and a procedure are developed by which maximum reliable parallel-series and series-parallel networks may be designed. These networks are composed of equal elements having open and short circuit failure modes. Reliability functions are developed for bridge and lattice networks composed of unequal elements having a single failure mode. These functions are given in two forms, one suitable for substitution into more complex networks and one suitable for desk calculation and computer programming. Reliability functions are developed for two, three, four, and five station polygonal networks composed of equal paths with single failure modes. Reliability improvement is shown as stations are increased.
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