A ZEPPELIN RUNNING CLOSE TO THE WATER, SHOWING THE HULL.—Underneath the framework and running along its whole length is placed a keel of triangular section, made of lattice work, covered with the same material as the hull. At two or four points in the length of the keel it is interrupted to allow the suspension of two or four boat-shaped cars, between which, and along the keel, weights run on rails, whose positions may be regulated in order to preserve equilibrium. These cars are built with a double bottom, and protected with strong rubber buffers. Thus precaution is taken for descending on water as on dry land. Each car contains an engine, which is an explosion motor, or so-called internal combustion motor. The liquid fuel is stored below each car and automatically pumped to the engines.

New Zealand Illustrated Sporting & Dramatic Review, Issue 1361, 25 May 1916, Page 35

A ZEPPELIN RUNNING CLOSE TO THE WATER, SHOWING THE HULL. —Underneath the framework and running along its whole length is placed a keel of triangular section, made of lattice work, covered with the same material as the hull. At two or four points in the length of the keel it is interrupted to allow the suspension of two or four boat-shaped cars, between which, and along the keel, weights run on rails, whose positions may be regulated in order to preserve equilibrium. These cars are built with a double bottom, and protected with strong rubber buffers. Thus precaution is taken for descending on water as on dry land. Each car contains an engine, which is an explosion motor, or so-called internal combustion motor. The liquid fuel is stored below each car and automatically pumped to the engines.