Excerpt from The Index of Training Films: A Guide to Motion Pictures and Slidefilms Available for Industrial Training Use Shows, through the use of smoke, the ow of air around airfoils. Skin friction, streamlining and the trend in design toward high speed air foils, the use of wing aps and their design, and the effect of ice on leading edges are shown. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."