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The discussor notes that the system described by C.C. Pine in the above-named work is quite similar to a system described in US Patent No. 1,741,282, issued to H. Busignies, which was filed on 18 Feb. 1927, corresponding to a French application filed 20 Feb. 1926. In replying C.C. Pine states he is in agreement that the system described by me is based on the same general principle as described in his US patent. The main difference between the system under discussion and Busignies' system is in the method of integrating the amplified voltages.