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where could I buy a new one beam splitter ,because the coating of beam splitter does not exist and when view through viewfinder the triangle from the rangefinder is not longer visible , and i try using a piece of blank 35mm color negative that has been processed which I put behind the beam splitter, and followed these procedures the triangle of beam splitter is visible , but appears as double triangle, probable first triangle is a reflection of 35mm colour negative film procesed , and the second triangle is reflection of beamsplitter glass.What do you think.Thanks
Your beamsplitter got mis-aligned. Review this IFIXIT guide: Kodak Signet 35 Beamsplitter Replacement. There should be a couple of small setscrews which has some glue on in to prevent it from shifting. One is to adjust the parallax (up & down) the other the infinity set.