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Siren
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Description: "Rotate the disk slowly, blowing meanwhile through a tube of about 3/16 inch bore, the nozzle of the tube being held opposite the interior ring of holes. As each successive hold comes before the end of the tube, a puff of air goes through the disk. As the speed of the disk increases, the puffs become more frequent, and finally blend into a whizzing sound in which the ear can detect a smooth tone. As the disk is given an increasing velocity, this tone rises in pitch." -Avery 1895
Source: Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 229
Keywords: siren, tube, holes, blow, rotation
Copyright: 2009, Florida Center for Instructional Technology. See license.
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Clipart ETC is a part of the Educational Technology Clearinghouse and is funded by various grants. Produced by the Florida Center for Instructional Technology, College of Education, University of South Florida. Email the project manager.