Geometry at work: Orbital Resonance, Sound and Water
Richard Proctor, Old and New Astronomy, 1892
What men recognized then in the movements of the heavenly bodies is true now and true for all time. And even in dealing with the limited knowledge and the imperfect methods of ancient astronomers, we need not hesitate to consider these movements as they are now recognized and understood.
Ernst Chladni, Die Akustic, 1802
Nodal lines of vibrating circular or polygonal  plates, according to Chladni and Savart.The breakthrough work acquired a status of foundational work of a new scientific field and earned him a title of "father of acoustics". It was the first systematic description of the vibrations of elastic bodies.
Snowflake Man
Wilson Alwyn "Snowflake" Bentley (February 7, 1865 â December 23, 1931), is one of the first known photographers of snowflakes. He perfected a process of catching flakes on black velvet in such a way that their images could be captured before they either melted or sublimated.
