38 Dirigible Balloons … Fig. 15. Zeppelin Dirigible Rising from Lake Constance together. Each engine drove a vertical and horizontal propeller. The propellers each had four aluminum blades. As will be seen from Fig. 15, the ears were too far apart for ordinary means of communication and so speaking tubes, electric bells,…
Dirigible · Zeppelin · Blimp · Aviation · Baloon
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