Demonstration of a disk siren
From the series
Source information
Type | Audiovisual
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Author | |
Keywords |
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Abstract |
This video demonstrates the principle of a disk siren.
The device consists of a rotating machine accompanied by a series of cardboard perforated discs and bearing indications on their use. The siren of the Opelt disk has 24 series of concentric holes. The top 15 produce simple sounds; others generate different arrangements and musical intervals. The disk is placed on a rotating axis. One of the drive belts connects to a large pulley fitted with a handle. The disk is rotated rapidly. A flow of compressed air coming out from a glass nozzle is directed against the disk. The rapid periodic interruptions of the air flow merge into a note whose frequency depends on the speed of rotation and number of holes. The different notes and chords are clearly audible. Using two or more nozzles, it is possible to generate more complex sounds. |
Year of Publication |
2015
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Date Published |
17 August 2015
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Publisher |
Fondazione Scienza e Tecnica
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Place Published |
Florence, Italy
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URL |
https://www.youtube.com/watch?v=9OHfQLtMWWc
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Categories and filter tags
Areas of Study
Physics and Mathematics
Instruments and Technologies
Siren
Featured Topics
Hearing and Listening
Music
Noise
Performance
Pitch
Sound Analysis
Sites of Knowledge
Institutes and University Laboratories
Workshops
Related objects
Copyright information
Copyright holder
Name
Fondazione Scienza e Tecnica
Contact details
http://www.fstfirenze.it/en/
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External license attribution - please review the terms and conditions of platform originally hosting this item
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Standard Youtube license
Digitization License
External license attribution - please review the terms and conditions of platform originally hosting this item