The three D-class harbor defense submarines were built to an Electric Boat Company Design at the Fore River Shipbuilding Company in Quincy, MA. All three boats were commissioned in the Navy with their original "fish" names. On November 17, 1911 the Navy changed its naming convention for submarines and these boats were renamed with their D-class names. They had their original general submarine series designations changed to the SS series on July 17, 1920.
A fine shot of the Grayling underway, most likely in the Cape Cod, MA. area, approximately 1910-1911. This photo was definitely taken between her commissioning in on November 23, 1909 and November 17, 1911 when she was renamed D-2. All three of her deck hatches are open, the Allied Signal Bell (used for underwater communications) is on the forward deck, and a temporary pipe frame & canvas bridge structure has been erected on the fairwater aft of the periscopes. The two sailors on the forward deck are readying to send and receive semaphore flag signals, possibly to another of the squadron's submarines, or to a supporting surface craft.
Photo courtesy of Wendy Gulley at the Submarine Force Library & Museum
Salmon moored at an unknown location, sometime between September 8, 1910 and November 17, 1911. The D-class boats were the last of the EB designs built without bow diving planes. The growing size of the boats made horizontal depth control while submerged much more difficult. Bow planes provided precise depth control, overriding the increasing hydrodynamic effect that the longer hulls had.
