A ratchet or rattle, more specifically, cog rattle is a musical instrument of the percussion family and a warning/signaling device. It operates on the principle of ...
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the ratchet device, using a gearwheel and a stiff board mounted on a handle, which rotates freely. Variants include the gragger (Yiddish: גראַגער) used in Judaism, the rapach, and the raganella.