Abstract
MOST of your readers will be familiar with Messrs. Tisley and Spiller's beautiful instrument, known as the phoneidoscope. In using it, however, I have found certain defects, which my improvement on it is intended to obviate.
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GORDON, J. A Simpler Form of the Phoneidoscope. Nature 18, 383–384 (1878). https://doi.org/10.1038/018383d0
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DOI: https://doi.org/10.1038/018383d0


