Naval hydroaeroplanes being tested at League Island Navy Yard in Philadelphia, PA. The photograph, taken on April 16, 1918, shows the initial testing phase. This image, numbered 7325, is not approved for publication. It was taken by Lt. N. McDonald and received by the Navy on April 8. The corresponding laboratory notes indicate that it is not for publication.

---

Size: 7983px × 6305px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., 1, 1918, activities, advancements, aerial, air, aircraft, american, apr, aviation, base, bases, development, early, experimental, historic, history, hydroaeroplan, hydroaeroplane, hydroaeroplanes, hydroplane, initial, innovations, interwar, island, league, lt., mcdonald, military, naval, navy, pa, period, philadelphia, photographs, secrets, technological, technology, testing, war, warfare, world, yard