Note:

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Chladni; Ernst Florens Friedrich
Die Akustik (digitalized version by SICD Straßburg)
Breitkopf und Haertel; Leipzig; 1802
Edition Francaise:
Traité d'Acoustique
Edit. Courcier, Paris, 1809
(early work on acoustics, sound patterns on glass/ metal plates etc., translations in English and French language exist. See
also a short instruction (excerpt) how to generate the sound patterns of Chladni's original text (in German)
Here's another good article from 1797 on generating Chladni's sound patterns (in German also)...