Flight times, 1910
Source: R. H. Macdonald album image 0011, San Diego Air and Space Museum Archives, https://www.flickr.com/photos/sdasmarchives/14197432491/in/photostream/. Photoshopped for contrast and detail.
Source: F. Alvin Jones album, image 00115, San Diego Air and Space Museum Archive. https://www.flickr.com/photos/sdasmarchives/13892156302/in/photostream/. Photoshopped.
A section of girder from the U. S. Navy zeppelin Akron, probably early 1931. San Diego Air and Space Museum Archives, Glen Bates album, photo 000089. http://www.flickr.com/photos/sdasmarchives/10561571625/. Photoshopped.