In 1938, the German airship LZ130 Graf Zeppelin, sister ship of the ill-fated Hindenburg, made its maiden flight.

CNN: Monday,

This technique found its apotheosis in 1928's Graf Zeppelin, which was kept aloft by the gas in a row of 16 cylindrical cells of fabric that collectively displaced 3.7 million cubic feet.

FORBES: The long, loud history of hydrogen as a motor fuel.