National Geographic : 1944 Jan
The National Geographic Magazine C.I.A.A. What's Cooking? A Ball of Amazon Rubber, not Lunch! This independent Amazon worker builds up a big wad of rubber on a rotating stick. Alternately he holds it over the pan of latex and pours on some of the white liquid, then smokes it over his gasoline-can fire-pot. Babassu palm nuts are frequently used as fuel for coagulation.