Siren

“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

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