Phonautograph (c 1857) apparatus for studying sound vibrations graphically, invented by (Edouard) Leon Scott de Martinville. Vibrations produced in cone traced on lamp blacked cylinder. Engraving, ...
February 27, 1827. A group of masked and costumed students, inspired by experiences in Paris, danced through the streets of New Orleans, becoming the city’s first Mardi Gras. A metro organization is ...
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