Creator:

National Museum of American History  Search this

Type:

YouTube Videos

Uploaded:

2012-05-08T17:34:40.000Z

Views:

2,128

Video Title:

Crova's Disc

Description:

Observe a demonstration of Crova's Disc from the Physical Science Collection at the Smithsonian's National Museum of American History. André Prosper Crova was a faculty member at the University of Montpelier. He invented this acoustic wave model in the 1860s and commissioned the prominent Parisian acoustic instrument maker Rudolph Koenig to manufacture it for him. It was first shown at the 1867 Paris World Fair. Crova's apparatus consisted of glass disks which were first painted black and then had a series of precise curves traced through the paint to the glass. The disks could be viewed in different ways, but generally were projected through a slit as they were rotated. The short arcs of the circles projected in this way represented particles of air and as the disk rotated these "particles" moved in precisely the same way that air moved when set in motion by a sound wave.

Video Duration:

46 sec

YouTube Keywords:

smithsonian "american history" history museum

YouTube Category:

Education  Search this

Topic:

American History  Search this

See more by:

SmithsonianAmHistory

Data Source:

National Museum of American History

YouTube Channel:

SmithsonianAmHistory

EDAN-URL:

edanmdm:yt_P8DbK-kMCTA