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siren disk
A siren disk is used in pneumatic sirens and has holes which are variously spaced apart. When the disk is spun in front of a jet of air, the holes modulate the air-jet which produces a sound. The pitch of a siren is produced by "the frequency of the impulses of compressed air passing through the openings in a rotating disk."〔(Nov 1922). "Siren Played by Sliding Drive Belt", ''Popular Science'', Vol. 101, No. 5, p.35. ISSN 0161-7370.〕 The pitch is therefore determined by the speed at which the disk rotates, the number of holes which air passes through, the size of the holes and their spacing apart.
==Typical usages of siren disks==
Siren disks were once used as the active element of sirens, but the majority of siren disks currently manufactured are used as instructional aids in teaching the mechanics of sound and music. For example, the Ontario Science Centre has a metal siren disk set up as an interactive teaching exhibit for children.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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