A musical clapper operated by foot.
A castanet or wooden sandal used for keeping time. Also known as scabillum.
(from the article `percussion instrument`) ...like a sandal, were known in Greece as kroupezai, or kroupala, and were adopted by Rome as the scabella. Other idiophones included bells, cymbals, ...Found on http://www.britannica.com/eb/a-z/s/38
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