Date: April 1, 1927
Creator: Raethjen, P & Knott, H
Description: The author's first experiments with a glider on flight characteristics demonstrated that an accurate flight-path measurement would enable determination of the polar diagram from a gliding flight. Since then he has endeavored to obtain accurate flight measurements by means of kinetograph (motion-picture camera). Different methods of accomplishing this are presented.
Contributing Partner: UNT Libraries Government Documents Department