Les avions militaires, simplifié, agrandie ; un exposé des motifs l'examen de leurs caractéristiques, performances, la construction, la maintenance et le fonctionnement, spécialement arrangées pour l'utilisation d'aviateurs et les étudiants . e, dans l'expédition, et l'offensive de l'workhas a ouvert une nouvelle phase de la guerre, aussi important qu'il est surprenant. La technique de l'utilisation d'avions en stratégie et tactique d'un isdecidedly objet pour l'expert militaire, mais l'desigaand la construction d'avions pour accom.plish certaines fins précises,et leur fonctionnement et d'entretien dans le domaine, sont des sujets t

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Military aeroplanes, simplified, enlarged; an explanatory consideration of their characteristics, performances, construction, maintenance, and operation, specifically arranged for the use of aviators and students . e, in dispatch-carrying, and ia offensive workhas opened a new phase of warfare, as significant as it is surprising. The technique of the use of aeroplanes in strategy and tactics isdecidedly a subject for the military expert, but the general desigaand construction of aeroplanes to accom.plish certain definite purposes, and their operation and maintenance in the field, are subjects that mayproperly be considered here. 8 A full consideration, therefore, is given to elementary theory andpractice applied in aviation, and the information used is primarilydesigned to be of definite service, in the field, where many unforeseendifficulties constantly arise. During the centuries of effort to conquer the air, the aeroplane is butone of many types of craft that have been devised. Before taking up the determination of its elements, therefore, it isnecessary, clearly, to distinguish the aeroplane from other craft designedto navigate the air. Aircraft may be divided into the following classes: ^»^. A Zeppelin Rigid airship and above it an aeroplane. The rigid balloon is onetype of floating airship. 1. FLOATING AIRCRAFT. The airship, is distinctly a lighter-than-air machine, con-sisting of a balloon or gasbag, containing a gas — hydrogen forexample — lighter than air, which by displacement of an equalvolume of air, gives a flotation, the magnitude of which is de-termined by the kind of gas, the size of gas container, and atmos-pheric conditions. The ordinary free balloon is, in short, nothingmore than a harnessed bubble, and the dirigible, or airship, is a balloon of elongated shape, fitted with steering apparatusand propelling mechanism. The Kite Balloon — This type of balloon is used for artilleryobservation both on land and at sea. It is Captive, in that it ish

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• bookcentury1900
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