snaps back into place, hurling the rock forward. Mars I, the first catapult created for this project, was a Bent Wood machine. Records set by Bent Wood catapults during the National Catapult Contests include the Rebelorum machine, built by students at Pascagoula High School in Pascagoula, Mississippi, throwing a one-pound spear 668 feet, three inches in 1974, Horologium Tintinnabulum, built by students at Mauston High School in Maustin, Wisconsin, which hurled a ten-pound rock 96 feet, 8 inches, in 1975, and Machina Gigantum, built by students of Ben Davis High School in Indianapolis, which hurled a one-pound rock 186 feet, three inches, in 1977. References Roman weapons