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Aviation History
1914
1914 - 1211.PDF
DECEMBER 18, 1914. PORTABLE AIRSHIP SHEDS. THE use of airships is to a large extent limited by the necessity or providing shelters at convenient places, so that should the weather or other circumstances necessitate it there will be no necessity for the airship to remain in the open Several suggestions with regard to projects for the building of temporary sheds have been put forward from time to time, and in the following are given some details of a design which has been evolved in Italy Our fiml DIRIGIBLE AIR-SHED CONSTRUCTION.-Arches in the course of erection. The pillars are built up of hinged sections. illustrations and description, for which we are indebted to our esteemed contemporary Scientific American, show the Bosco and Donadelli system of portable hangars, which has been tried for field work by the Italian aeronautical corps. " The different sections which make up the arches are locked together by using a hinge clamp which is pecu liar to the present system. Tooth projections on one piece fit into recesses on the opposite piece like the two halves of a hinge, so that when placed together, all that is needed is to run a pin through the matched holes in order to couple the two pieces. Each arch is made up of a certain number of sections which are thus joined together, and there are two separate hinge joints used at the meeting point. After locking one joint as we have seen, this forms a hinge so as to bring the other joint in place, and it is then ready to be locked as before by means of a pin, so that the two sections are tightly fixed togethered by means of the two joints. To dismount the sections, the only operation needed is to withdraw the two locking pins so that the joints readily come apart. In this way the arch is built up while it is lying on the ground, and is then ready to be mounted in an upright position. At the proper points on the ground the base plates are laid which form the foot of the arch. Each plate carries projecting lugs in the shape of a half-hinge. These are made to match with a like part on the arch end so as to make the joint. After running a pin through the hinge while tin arch is lying on the ground, the last is raised to the upright position by using ropes and pulleys, and when in place, the second joint between base-plate and arch now matches, and this is fixed by driving in a pin, so that the arch is now fixed to the base-plate very strongly. The second arch is now raised m tin same way, and the two are bound together by cross brace pieces of structural iron work, as will be noticed, and so on until the right number of arches is erected. " Another point in the assembling of the hangar needs to be considered, this being the erecting of the structural iron poles or towers which are required in order to draw up the arches by means of cables. It has been a problem to set up such towers in the proper way in field work, as they must have a considerable height in order to serve for handling the arches and at the same time must be very strong in view of the great weight of the arch. The Italian constructors make use of the hinge joint principle in a very good way for mounting the towers. In the first place, a short structural iron pole is fixed on the ground upon the base plate so as to form the lower and centre part of the tower. It carries a set of pulleys at the top r,TDir-TRTF AIR-SHED CONSTRUCTION.-On the left showing three sections In place covered with the DIRIGIBLE AIR-StltilJ ^n* ^ on ^ ^^ % tfaen nJui Jmo ^^ metallised cloth which is used «ca P photograph on the right. 121 I
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