Graudenz | -- | Designed for 1914 Hannover | -- | Designed for 1914 Hamburg--Fuhlsbüttel | Hamburg Airship | (1911) | Harbour Society | -- Hamburg--Hansa | -- | -- Kiel (1910) | Union for Motor-Airship | -- | Travel | Königsberg-in-Preussen | | -- (1911) | Prussian Army | Leehr | -- | Designed for 1914 Leipzig | Leipziger Luftschiffland | -- | Flugplatz Gesellschaft | Liegnitz (1913) | Prussian Army | In construction Mannheim--Schwetzinger | -- | -- Mannheim--Rheinau | Luftschiffbau | (1909) | Schütte u. Lanz | -- Metz (1909) | Prussian Army | -- Potsdam, near Berlin | Zeppelin Society | (1911) | -- | -- Posen | -- | Constructing Schneidemühl | -- | Building Strasbourg | Prussian Army | -- Thorn (1912) | -- | -- Trèves | -- | Building Waune (1912) | Rhenish-Westphalien | -- | Flying | | and Sports Club | -------------------------+--------------------------+------------------ Such monster airships as the Zeppelin call for a large proportion of pure hydrogen. This is, indeed, manufactured on a large scale in Germany. It is produced in quantities by the electro-chemical works at Bitterfeld, Griesheim, and at Friedrichshafen, specially for the needs of the Zeppelins at the latter place. There are also works for the production of very pure hydrogen by electrolysis at Bitterfeld, Griesheim, Gersthofen, and Dresden. In the particular way Germany means to use her lighter-than-air fleet in the present war time will show. If, however, there have not yet been attempts at any combination of action, individual Zeppelins have already played the rôle of dreadnoughts of the air. Though their powers have been no doubt exaggerated, they have been the terror of some Belgian cities.