Help


from Wikipedia
« »  
He is perhaps most famous as the man who almost, but not quite, invented the phonograph.
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.
The inventor gave the name of Paleophone ( voix du passé ) to his invention.
On April 30, 1877 he submitted a sealed envelope containing a letter to the Academy of Sciences in Paris explaining his proposed method.
The letter was read in public on the 3rd December following.
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.

1.910 seconds.