Dirigeables passés et présents, et les chapitres sur l'utilisation de ballons dans le cadre de la météorologie, la photographie et le pigeon voyageur . un revêtement intérieur ofrubber est requise afin de protéger le calicot de ses effets.l'air-bag a été augmenté à une taille de 17 650 pieds cubes, et dividedinto trois parties ; le ventilateur a également été disposées de façon plus convenientposition, et placées plus près du corps. L'air-chamberswere qu'il est aménagé dans le premier modèle qu'à être rempli par le biais d'un top longneck qui atteint jusqu'à la voiture. C'était trouvé incohérences-venient, parce qu'à pleine vitesse, la pression du vent était s

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Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . an inner coating ofrubber is required in order to protect the calico from its effects.The air-bag was increased to a size of 17, 650 cubic feet, and dividedinto three parts; the fan was also arranged in a more convenientposition, and placed closer to the main body. The air-chamberswere so arranged in the first model as to be filled through a longneck which reached down to the car. This was found incon-venient, because at full speed the wind pressure was so great asto make it difficult to pass air into the neck. There was also thegreat danger wThich might arise if flames should break out in theneighbourhood of the motor, and be carried up by means of the 78 AIRSHIPS PAST AND PRESENT. neck. The fan was therefore driven by the motor; if themachine was at rest, an electric motor and a battery of accumu-lators were carried to supply the necessary power. Besides themain valve, there were also two safety valves, which allowed thegas to escape under a pressure of 1*4 in. of mercury. Two small. Fig. 40, -Framework and car of Lebaudys dirigibleballoon. windows were provided for inspecting the inside of the balloon.Every possible precaution was taken to ensure the stability ofthe machine. A horizontal oval-shaped sail of blue silk, havingan area of 1, 055 square feet, was stretched below the stand; andbeneath it there was a vertical sail, of much smaller dimensions, of the nature of a keel. At the back, which was ellipticallyshaped, surfaces having an area of about 240 square feet, and DIRIGIBLE BALLOONS FROM 1898 TO 1906. 79 shaped like the tail of a pigeon, were arranged round the mainbody, and were crossed at the middle by a small vertical sail.Instead of having only one rudder, the new model had two, which were smaller and placed further back. They were movableabout a horizontal axis, and of the shape of a V, with the pointedend towards

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