The Pocket Guide to World HistoryClocks. 3500BC Gnomon. 2000BC Chinese. 8C BC sundial 4C BC Greek water clock. 300BC hemispherical sundial 160BC Rome. 12C mechanical. 1379 de Vick. 1657 Huygens pendulum. [Read more ...] 1954 © Copyright 2007 PocketHistory.com Hosted by BenLo Park |