Aviation Sans Formules.

Paris, Librairie du XXe Siecle [1909]. Octavo publisher's colour printed wrapper (marked); 72pp, 13 plates (one colour litho, most of the others photo plates), decorative vignettes and diagrams through the text. Quite a good copy. An odd and charming book: the principles of aviation are explained by an engineer in a two act play. Not something you come across that often. The play is followed by a chronology and dictionary of terms. The colour plate illustrates a couple of simple mechanisms you can make at home.