The German Zeppelins, on the other hand, stand out in public imagination as a failure in the war, especially because the British shortly established an airplane barrage which proved to be their masters. This view is correct only in so far as it applies to interior raiding, for which, indeed, the Zeppelin was not designed. How untrue it is of the Zeppelin as the outpost for the German fleet British officers will readily admit. Indeed, they credit them with the escape of the German fleet at Jutland, one of the deepest regrets in British naval history. As eyes for the German fleet in the North Sea, the Zeppelins, with their great cruising range and power of endurance, proved almost invaluable. Airships have, then, behind them a rich heritage and before them a bright future. Much work that the airplane can do they cannot do; while, on the other hand, much work that they can do the airplane cannot. The two services are essentially different and yet essentially complementary. Between them they offer nearly every facility and method of travel in the air which could be desired. Each must be equally developed in order to increase the efficiency and the value of the other. The great difference, of course, between the airplane and the airship is that the former sustains itself as a heavier-than-air vessel by the lifting power of the air in relation to a body driven hard against it by its powerful engines, while the latter sustains itself as a lighter-than-air body because of the large amount of air displaced by a huge envelop loaded with gas much lighter than the air itself. The contrast is obvious; one vessel is small, agile, and very fast; the other is slow and clumsy. The airship cannot attain anything like the speed of the airplane, nor can it go so high or maneuver so quickly, but on the other hand, at least for the immediate present, it can stay afloat very much longer and carry much greater weight. Moreover, the airship has certain other easily perceptible advantages over the airplane. Ordinarily an airship need not fly at much more than a thousand feet, which not only makes far less cold traveling than at higher altitudes, but also allows the passengers to enjoy the view far better than from an airplane, whence the world below looks like a dull contour map. An airship also flies on an even keel; it does not bank as an airplane does nor does it climb or descend so quickly. At present airship travel gives a greater feeling of comfort and security. Sleeping is a calm experience; moving about comparatively simple. Also there is less noise than in an airplane where the engines beat incessantly and the wind rushes through the wires and struts. An airship has no wires and can at the same time slow down and even shut off its engine, so that it need be no more noisy than a motor-car. Engine failure also is not so serious as in an airplane, for the gas-bag will always keep the ship up until there has been a chance for repairs.