Simple siren disc demonstration //. Homemade Science with Bruce Yeany

Here is a simplified version of the Seebeck siren disc that has been a classic physics demonstration showing the relationship between frequency and pitch. The siren disc has a long history is sound studies and was first introduced by Thomas Seebeck in 1841 as a method of generating pure tones. It continues to be a staple of high school and college physics classes as it visually demonstrates the production of sound by interrupting the air flow through a series of holes located on a spinning disc.