Illustrated Companion to the Latin Dictionary/Polyspaston

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

POLYSPA'STON (πολύσπαστον). A contrivance for raising weights by the assistance of many pulleys (orbiculi) set in a case (trochlea). Vitruv. x. 2.