Third-person ANS in German, signed “Albert,” one page, 4.5 x 6.75, no date. Below a printed facsimile poem celebrating his fiftieth birthday (dated March 14, 1929), Einstein writes: "Hopelessly buried in an avalanche of papers, your Albert thanks you heartily for the time being. Your lines again show that nothing in later life is equal to the friendships of youth. The theory of electricity based on parallelism at a distance becomes ever more attractive. Whether it is true, however, I still don’t know. It will be revealed soon." In fine condition, with scattered creasing, and an unobtrusive diagonal fold passing through the signature.
At the beginning of 1929, Einstein published equations for his unified field theory of gravitation and electro-magnetism, based on the concept of parallelism at a distance with respect to four orthogonal vectors of reference. He continued to pursue the subject of the 'Unified Field Theory' for the rest of his life, though he never satisfactorily mastered the problem—it remains unsolved to this day. Boasting superb content on his "theory of electricity" on an unusual printed poem card, this is an outstanding scientific Einstein piece.
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