Page "Charles Cros" Paragraph 3
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No one before M. Charles Cros had thought of reproducing sound by making an apparatus capable of registering and reproducing sounds which had been engraved with a diaphragm.
On April 30, 1877 he submitted a sealed envelope containing a letter to the Academy of Sciences in Paris explaining his proposed method.
In his letter, after having shown that his method consisted of detecting an oscillation of a membrane and using the tracing to reproduce the oscillation with respect to its duration and intensity.
Cros added that a cylindrical form for the receiving apparatus seemed to him to be the most practical, as it allowed for the graphic inscription of the vibrations by means of a very fine-threaded screw.
An article on the Paleophone was published in " la semaine du Clergé " on October 10, 1877, written by l ' Abbé Leblanc.
Cros proposed metal for both engraving tool attached to the diaphragm and receiving material for durability.
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