National Geographic : 1931 Feb
THE AUTHOR CROSSES AN AIRY LIANA BRIDGE The design of these bridges and their method of construction are of great antiquity. They will carry a distributed load of upward of a ton, but they creak dangerously if even two men come very close together on them. RIVER TRANSPORT INCAMEROUN When an unbridged stream was reached, two stalwart black boys under took to get the author across dry. Onanother occasion, when thewater was higher, five natives were employed (see text, page 250).