Two variants of this work exist, one with the ""Declaratio"" in Latin and Italian, the other with the addition of three other languages. Only a few copies survived and they often do not present a complete text in all the five languages. This book was written in Italian, Spanish, French and German. The tables represent a varied set of the projects, inventions and creations of the author. There Veranzio wrote about water and solar energy, the universal clock (Plates 6–7), several types of mills, agricultural machinery, various types of bridges in various materials, machinery for clearing the sea, a dual sedan traveling on mule (Plate 47), special coaches, and "Homo Volans" (Plate 38) a forerunner of the parachute. His work included a "portable boat" (Plate 39), that is to say a boat that, thanks to the same energy as the current may go against the river (Plate 40). It was his idea to use the printing rotary principle (e.g. grinding them printers, Plate 46) in order to alleviate the great difficulty of printers and improve results.