National Geographic : 1944 Sep
Salt for China's Daily Rice Aene A Centuries-old Engineering Marvel in Bamboo, Tzeliutsing Is Free China's Salt Capital Literally, Tzeliutsing means "Self-flowing Well." Two thousand years of salt production, however, have dissipated any artesian effect. Drillers questing now for brine delve 3,000 feet and more. Tzeliutsing, 110 miles west of Chungking, produces almost half of Szechwan Province's 500,000 tons of salt a year. The city is essential to China's war economy, for Japan controls the sea salt. Here ten pipes, trestled across a valley, carry brine from a large well. A hoisting derrick pierces the roof of its shed (center). Clear air indicates that evaporating plants in this vicinity burn natural gas from one of the "fire wells" discovered by brine drillers.