ORIGINAL DESCRIPTION (1919) - In the compilation of this book, the guiding principle has been to use matter of actual theorico-practical value to the aviation students to enable them to work knowingly. For a given aeroplane part, the most common term has been chosen out of the maze of confusing terminology, which ought to have been relegated into oblivion long ago to facilitate the study of one of the greatest, if not the greatest, products of the human mind. Admittedly, the aeroplane is in its infancy, but an infant that can go at such a high rate of speed and perform such marvelous feats certainly deserves more than passing attention, and it is high time to standardize the names of its parts, at least.