Orders placed online and which are over $299 ex gst are delivered freight free anywhere in Australia. Offer is valid until 31 December 2024 and excludes: (i) orders involving chemicals and (ii) orders involving oversized items such as safety cabinets, ovens, incubators, trolleys etc. Such items are highlighted on our website.
Stock status: PreorderThis item is not in stock but is available to purchase. As soon as the item is in stock, it will be shipped to you. Lead times will vary depending on the item, please contact us on [email protected] for more detailed information.+
Blow air through the holes of a spinning disk to produce different tones. More holes and a faster-spinning disc make for higher-pitched sounds. Demonstrate musical intervals, the relation of pitch to frequency, and autocorrelation in psycho-acoustics
This 'Siren Disc' consists of a metal disc about 180mmD, mounted on a central shaft so that it can be rotated. The disc has 4 rows of holes around it and when a fine jet of air is blown through the rotating holes, a 'siren tone' is produced. The holes are 24, 30, 36 and 48 and this is a ratio of 4, 5, 6, and 8. The combined sound of all 4 holes creating a siren sound is a natural musical chord. For the blow tube only, see 3770001.
