Das Flugprincip (The Flight Principle) is a book about aviation written by German engineer and inventor Carl Buttenftedt. The book, first published in 1884, outlines Buttenftedt's theories on the principles of flight and includes detailed depictions of his flying machines. Despite never actually achieving sustained flight, Buttenftedt's work was influential in the early development of aviation technology. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
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