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about these matters, but it is extremely difficult for any of the representatives of the allied governments to find them out. It is of the highest importance that we keep abreast of the development in explosives because, if we can get an explosive which will give the same power with half the weight we have at the present time, it means a great increase in the effectiveness of our projectiles. 
  A great deal of work has been done in photo topographical work, in lenses, in high altitude work, and in reproduction of photographs. I found no evidence, however, of film development being up to what ours is in this country -- that is, none of their cameras were equipped with rolls of film in the same way that several of ours are. Their optical instruments for bomb sights, drift indicators, etc., are very good, but they are quite behind the times now because they have not had an opportunity to use them in the air for sometime. 
  The provisions of the Treaty of Versailles allow the Germans to begin aeronautical construction during the coming Summer. It is expected, however, that the size of the airplanes will be limited, however, that the size of the airplanes will be limited, the power of their engines, their speed, and their ceiling, so that it will be very difficult for them to

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