Abstract
As a corollary to the interesting observation with the phonograph recorded by Prof. Fleeming Jenkin and Mr. Ewing in the last number of NATURE, will you allow me to point out that every capital letter of the Greek alphabet except P and P is actually (either as written or when turned through an angle of 90°) a reversible or a reduplicate symbol.
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CORFIELD, W. Elements of Articulate Speech. Nature 17, 447 (1878). https://doi.org/10.1038/017447a0
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DOI: https://doi.org/10.1038/017447a0
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