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A discussion of the theory and applications of activated delay lines is presented. The term "activated delay line" is derived from the fact that the equivalent circuit of a ceramic electroacoustic receiving transducer is a capacitor in series with a voltage generator and for this reason may be inserted directly into an LC delay-line receiving array matrix. Equations are derived which give array gain as a function of the number of serially added array elements. Very large arrays are theoretically possible. Since activated delay lines are composed entirely of passive components, they are very rugged, reliable, and relatively inexpensive.