Once the masting technique had been worked out, the Graf Zeppelin and the Hindenburg, in the years 1930-6, made a record of regularity which no other vehicle of transportation has approached. They took off at times over the ocean for Europe when all other aircraft in the area was grounded, when the fog hid the entire top half of the ship, and the ship disappeared into the fog within a few seconds after the “Up Ship” signal was given. What few delays appear on the record were due to waiting for connecting airplanes to arrive with the latest European mail for the Americas. So far the use of masts had been entirely a matter for the large rigid airships. The Army did the first development work on high and low masts for its smaller ships at Scott Field, as well as a landing wheel for them to ride on. A situation at Akron started experimentation along a different line. At Goodyear’s Wingfoot Lake Field, Mr. Litchfield frowned over the expense of having a considerable crew on hand to land and launch the blimps, with little to do after the ship was in the air. To an Army or Navy post, with plenty of men in training, this surplus of men was no difficulty, but any private corporation operating passenger airship lines would find the expense burdensome. [Illustration: The Navy L-2, one of the first ships under the expanded program, lands at Wingfoot Lake, Akron, is walked to the mooring mast.] [Illustration: Close-up view of engine and cowling, and swiveled landing wheel.] [Illustration: With a drogue or sea anchor to hold the airship steady, supplies or personnel may be taken aboard at sea. (U. S. Navy photo)] [Illustration: A newly-hatched airship breaks its shell at Akron, will try its wings then join the Navy.] He put the question to his men in 1930, offering cash prizes for the best solution. Out of many ideas, one clear-cut line of progress appeared. This was to make the ground crew truck a maneuvering base, with a mast on top, which could be folded down when not in use. The truck then could not only hold the ship on the ground, but guide it in and out of the hangar with more security than by using a large number of men. Extra wheels mounted on outriggers kept the truck from being turned over by side gusts. In succeeding years the ground crew truck became a traveling mooring point which could follow the ship across country, give it anchorage when night fell, and at the same time act as a traveling supply depot, machine shop, radio cabin, and crew quarters. A portable mast, built in sections, high enough for ships to mast at the nose, was the next step. It could be set up on an hour’s notice, anchored by guy wires and screw stakes for more extended operations. Gradually the airship became independent of the hangar, came to use it only for overhaul and the purification of its helium gas. The blimp could be fueled and serviced completely in the open.