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HEIFITZ SCIENTIFIC AUDIENCE CAMBRIDGE, Mass., Nov. 8. Jascha Hel-fitz, noted violinist, gave a two-hour violin concert in the physics laboratory of Harvard University before Professor Saunders and his assistant Monday. The purpose of the concert was to enable the scientists to analyze and record the sound waves to determine whether modern technical craftman-ship can produce a violin resembling the hand-made works of Stradivari us and Guar-nerL