Principles, on which it appears that a more perfect system of currency may be formed either in the precious or non-intrinsic metals [microform] : so as to produce a representative coin or token, the genuineness of which may be instantly determined by a separate gauge, or an intrinsic self-gauging coin, any counterfeit of which must be immediatly detected, however accurate the resemblance or exact the weight / by Sir William Congreve

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