was the only Dahlgren rifle (other than the 12-pounder boat howitzer) that continued in service after the American Civil War. Crew of six and a powder-boy, firing a 20 lb. shell in front of 2 lb. of powder it had a range of 1,960 yards at a 6.5° elevation. Thirty-pounder rifle: these guns were iron with bronze trunnions and trunnion bands. They were cast at the Fort Pitt Foundry and the Washington Navy Yard. In February 1862, Dahlgren recommended that the first 13 cast at Fort Pitt be withdrawn because the iron was inferior. One 30-pounder rifle was mounted on USS Harriet Lane. Fifty-pounder rifle: these guns were typical Dahlgren rifles—iron with bronze trunnions and trunnion bands. They were apparently a popular design, although by the end of the war it had been supplanted by the 60-pounder Parrott rifle, which continued in service after the American Civil War. A photograph of Admiral Dahlgren leaning against a 50-pounder rifle may be found at the beginning of this article. Eighty-pounder rifle: the first 80-pounder was cast at the West Point foundry with trunnions. Subsequent rifles were cast without trunnions and bronze trunnion band and trunnions were added. The gun was initially well received but soon showed a tendency to burst. , a converted Coastal Survey ship armed with one IX-inch Dahlgren and one 80-pounder Dahlgren rifle was engaged in the bombardment of Roanoke Island in support amphibious landings, when the following entry was made in her log for February 7, 1862: "At 5:15, rifled 80-pounder aft, loaded with six pounds powder and solid Dahlgren shot, 80 pounds, burst in the act of firing into four principal pieces. The gun forward of the trunnions fell on deck. One third of the breech passed over the mastheads and fell clear of the ship on the starboard bow. One struck on port quarter. And the fourth piece, weighing about 1,000 pounds, driving through the deck and magazine, bringing up on the keelson, set fire to the ship. Fire promptly extinguished." One hundred-fifty-pounder rifle: the 150-pounder was a typical Dahlgren rifle with a cast iron barrel and a bronze trunnion band and trunnions. Although the test firing was successful the guns were not placed in service, because Dahlgren doubted the quality of the iron. Twelve-inch rifle: in 1864 the Fort Pitt foundry bored three XV-inch Dahlgren shell gun blanks, one was finished using the Atwater design,