Dirigibleor Airship, a balloon that is self-propelled and that can be steered. There are three types: (1) the rigid dirigible, which holds its shape by means of a rigid metal framework around the gas cells; (2) the semirigid dirigible, which has a rigid keel along the bottom inside a single fabric gas bag, known as the envelope, but no framework around the envelope; and (3) the nonrigid dirigible, which holds its shape only by the pressure of the gas inside the fabric envelope.
WHAT'S INSIDE: WORLD WAR I
FEATURED: WORLD WAR I
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Gallipoli Campaign, an Allied attempt in 1915, during World War I, to seize the Gallipoli Peninsula in Turkey and thus gain control of the Dardanelles strait, opening a supply route from the west to Russia through the Black Sea.
World War I, also known as the Great War, left Germany and other countries humiliated and angry. Germany viewed the armistice that ended World War I as a truce, rather than a surrender. This view was ignored. Learn about events that led to World War II.