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|238k||From inboard to outboard: O-11 (SS-72), O-13 (SS-74), O-14 (SS-75) , O-15 (SS-76), O-16 (SS-77), and O-12 (SS-73), at the Washington D.C. Navy Yard, circa 1918-24. ||USN photo # 80-G-1024950, from the National Archives and Records Administration (NARA), courtesy of Daniel Dunham.|
|122k||Lake boats show their distinctive sterns at Philadelphia Navy Yard in 1919: O-boats, inboard O-12 (SS-73), outboard O-14 (SS-75), middle boat,N-7 (SS-59) and two other unidentified boats.
After WW I the U.S. Navy standardized on Lake's flat stern, whose buoyancy kept the propellers and diving planes down in the water.
|Photo i.d. courtesy of Dave Johnston (USNR).
Photo & text courtesy of U.S. Submarines Through 1945, An Illustrated Design History by Norman Friedman. Naval Institute Press.
|88k||O-14 (SS-75), off Mare Island Navy Yard, Vallejo, CA., circa 1924. Note unidentified Navy collier in background.||USN photo courtesy of ussubvetsofwwii.org. Photo i.d. courtesy of Robert Hurst.|
|81k||O boats possibly in Phila. PA circa 1924: |
From inboard to outboard: unidentified O boat, [probably O-13 (SS-74) or O-15 (SS-76)] O-11 (SS-72), O-12 (SS-73), O-16 (SS-77) & O-14 (SS-75).
|USN photo submitted by Charles Worcester.|
|134k||PDF entitled "How the Diesel engine came to America."||Photo courtesy of subvetpaul.com.|
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