Ratchet (instrument)

Ratchet

Classification	Idiophone
Hornbostel–Sachs classification	112.24 (Scraped wheels – cog rattles or Ratchet)
Related instruments
Derkach

A ratchet or rattle, more specifically, cog rattle^[1] is a musical instrument of the percussion family and a warning/signaling device. It operates on the principle of 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.