31. Gingrich ( DOWN ) : U . S . House Speaker increasingly resembles dirigible . 32. Dirigibles : the next big thing . 1934.33. Meanwhile, somebody get the dirigible hangar ready. 34. The 1937 Hindenburg explosion killed 35 passengers and the promising hydrogen dirigible passenger industry. 35. McCalla Field was established in 1931 and dirigibles . 36. Ratigan frees himself and escapes on his dirigible with Fidget, holding Olivia hostage. 37. If the dirigible displaces exactly its weight, it hovers at a constant altitude. 38. During the 1930s, the Navy briefly used the air base for helium dirigibles . 39. The machine spins onto the dirigible , bursting the balloon and sending it aground. 40. The flight was of an unmanned, steam powered dirigible operated by Frederick Marriott.
