— DANFS: "4 21” tt" —Friedman, U.S. Battleships:
—Friedman and Jurens,
Naval Firepower: p. 292: "The U.S. Navy, however, doubled the number of underwater tubes in the New York and Nevada to four."
—
GlobalSecurity.org: "4 - 21 in torpedo tubes (above water)"
—Fitzsimons, Illustrated Encyclopedia of 20th Century Weapons and Warfare: p. 1982 supports 4
—Friedman, U.S. Battleships: p. 438 "Torpedo Tubes 2 - 21in submerged"
—
HyperWar: "2x1 21" tt"
—The Battleship in the United States Navy: p. 46 supports 2
—The United States Navy in the World War, James Clayton Russell and William Emmet Moore, 1921.
—Battleships of World War I, "2 x 535mm/21in torpedoes" p. 59, Peter Hore, 2006
— DANFS: "4 21” tt" —Friedman, U.S. Battleships:
—Friedman and Jurens,
Naval Firepower: p. 292: "The U.S. Navy, however, doubled the number of underwater tubes in the New York and Nevada to four."
—
GlobalSecurity.org: "4 - 21 in torpedo tubes (above water)"
—Fitzsimons, Illustrated Encyclopedia of 20th Century Weapons and Warfare: p. 1982 supports 4
—Friedman, U.S. Battleships: p. 438 "Torpedo Tubes 2 - 21in submerged"
—
HyperWar: "2x1 21" tt"
—The Battleship in the United States Navy: p. 46 supports 2
—The United States Navy in the World War, James Clayton Russell and William Emmet Moore, 1921.
—Battleships of World War I, "2 x 535mm/21in torpedoes" p. 59, Peter Hore, 2006