First edition of this very rare, early, and remarkable brochure on navigation in the air and the dirigible (manoeuvrable balloon). The brochure introduces a new project to build a dirigible in the shape of a fish. The cost was estimated at 30.000 francs and was to be financed by the issue of 300 shares of 100 francs. The work explains the expected profits, and the workings of the dirigible, in order to entice patrons. It is an early example of such a project, as the first powered and steerable airship that was able to take flight was invented in 1852, eleven years after the publication of the present work. This curious brochure therefore offers a fascinating insight into the history of aviation.
The fish dirigible is shown in detail on the large, folding plate. It was proposed to ascend (the balloon being in equilibrium) by means of wings, to obtain propulsion by four small paddle-wheels, and to steer by means of a large triangular rudder. It was approximately 25 meters long and 12 meters high, and operated from a basket hanging underneath, like in a hot air balloon. It was invented by bookseller and author Alexandre-Jacques Sanson (1789-1862) and his father. The dirigible was never built, but the Sansons nevertheless published a number of other works elaborating on the same subject in the following years: Navigation atmosphérique. Explications complémentaires sur le système (1845); Explication du système de navigation aérienne (1848), and Solution du problème de la navigation aérienne, principes, preuves et moyens (1850). The present work ends with a letter by the aeronaut Jules-François Dupuis-Delcourt (1802-1864), giving permission to use some of his data in the brochure, and offering his blessing to the project.
The wrappers are somewhat creased, with tears at the head and foot of the spine. The folding plate has browned. Otherwise in good condition. Tissandier, p. 34; WorldCat 457418223, 907812680, 1141280150 (13 copies).