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evidence of the faith that the French have in the future of Military and Commercial Aeronautics. 

A free space is provided around these hangars so as to obviate as far as possible the danger of fire and to limit the amount of damage in case of explosion from any cause whatever. The hydrogen plants which are of permanent construction are also isolated and far from any of the more important buildings. 

The hangars occupied by the French Bombardment regiment at Neustadt constitute an interesting study. This airdome was constructed and occupied by the Germans during the war. The hangars are not high enough but are well constructed throughout. The construction is of concrete with concrete floors. Most important is their unique heating system. Underground hot-air pipes empty into several floor vents about six inches in diameter located about every twenty-five feet. They are practically underneath the stall space that would ordinarily be occupied by an average machine. These holes are flush with the floor surface and can be covered with ventilated cover plates. 

In cold weather, little hot air stoves can be installed over each of these holes to allow better diffusion of heat. Keeping

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