"The most ticklish task of piloting any dirigible, whether it be the smallest blimp or the mammoth Akron, is to maneuver the ship when it has slowed down for a landing..."

"Emery Koch, a German engineer, has recently obtained patents on a steering device which promises to make aircraft maneuverable at all speeds."

"This device consists of four reversible pitch propellers installed within, or in place of, the rudders and vertical fins of the aircraft..."