Sheaves and blocks.
Vitruvius (De Architectura 10.2): In trocleam induntur orbiculi duo per axiculos versationes habentes. Two pulley wheels are inserted into the block, turning on its axles. From what I can tell so far, classical Latin does not seem to have a word exactly corresponding to ‘pulley’; there was the sheave—the grooved wheel itself—orbiculus, and there was […]
Also tagged 1st century BC, orbiculus, pulleys, trochlea, Vitruvius