In a paper published in the Journal of the Aëronautical Society of Italy, p. 267 (1906), I explained some interesting points regarding certain constructional technical advantages, dynamic and economic, special to the systems of dirigibles, which have a cylindrical form of great length, a very much reduced midship section, and a minimum distance between the point of action of the ascensional force and the axis of the car, of which the “ Zeppelin ” shows, in practice, a very successful example.

Mr. Laboccetta, in his paper, in the same Journal, page 2, 1907, when comparing certain types of dirigibles, pointed out the influence of the co-efficients of resistance to forward movement, the value of extended forms, the importance of fair shapes and lifting power, and showed the advantages of the extended shape in certain cases.