Illustrated Companion to the Latin Dictionary/Tribulum

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. 

TRI'BULUM and TRI'BULA (τὰ τρίβολα). A machine employed in threshing corn; consisting of a wooden platform, having its under surface studded with sharp pieces of flint or iron teeth. It was drawn over the grain by an animal attached to it, and often weighted by objects placed on the top, or by the driver himself standing upon it. (Varro, R. R. i. 52. 1. Plin. H. N. xviii. 72. Virg. Georg. i. 164.) The practice is retained in the East, where the machine exhibited by the illustration (Tribulum/1.1) still continues in use.

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  Tribulum/1.1