National Geographic : 1944 Sep
334 The National Geographic Magazine It Looks Like Winter's Snow, but Bare Feet and Chests Show It's Summer's Salt Precipitated in evaporating pans (below), the salt has cooled. The average Chinese requires 8 to 10 pounds a year. The industry sustains almost a million in Szechwan. In Marco Polo's day, salt passed as money. Acme As Vapor Floats Off the Brine, a Long Pole Drags the Residue Out of the Boiling Pan By night the fires under thousands of pans cast a glow across the city. A full day or more is required to boil off the liquids. A bean juice mixed with the brine collects impurities for skimming off.