Image L90-5521 is available as an electronic file from the photo lab. See URL. -- A technician prepares to unlatch a door built into the guide vanes - which here form an ellipse 58 feet high and 82 feet wide - make possible a smooth and uniform flow of air through passageways. Photograph published in Winds of Change, 75th Anniversary NASA publication. Page 16. Image 90-5521 available as electronic file NASA 90L05521.