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Two analog devices are described which are useful in solving the approximation problem of network synthesis. Both devices utilize a sheet of conducting Teledeltos paper to produce a two-dimensional potential field which simulates a required network function. The first device simulates the gain and phase of a network, and is primarily useful in designing networks for a prescribed steadystate response. The second device simulates the real part of the function, and is useful in designing networks for a prescribed transient response.