The gun was designed to replace the M2 Browning and four barrels were required to duplicate the rate of fire. The first shipboard installation, in 1939, was nicknamed the Chicago Piano. [1] By 1941, these guns had been mounted on destroyers, cruisers, battleships, aircraft carriers, and some auxiliary ships.

The term Chicago piano was used as a nickname for pre WW2 US Navy anti-aircraft weapons: 1.1-inch anti-aircraft gun; Multiple 2-pdr pom pom anti-aircraft gun

Only a few old hands probably recognize the odd-looking U.S. Navy shipboard antiaircraft gun often seen in action in World War II movies and television features. The four-barrel 1.1- inch mount usually seen blazing away at attacking Japanese aircraft was known in its time as the “Chicago Piano.”

The quadruple 1.1-inch machine cannon, affectionately known as the “Chicago Piano,” was the first medium-range antiaircraft gun adopted by the U.S. Navy. 1 Engineered and built by the Naval Gun Factory during the Great Depression, it was designed specifically to combat dive bombers.

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Mark 4 guns led to a prototype 1.1" (28 mm) single-barrel gun and tests with it were conducted between March and May 1931. The second version, designated as the 1.1"/75 (28 mm) Mark 2, was based upon a design by Robert F. Hudson.

The Thompson submachine gun (also known as the "Tommy gun", "Chicago typewriter", or "trench broom") is a blowback-operated, selective-fire submachine gun, invented and developed by Brigadier General John T. Thompson, a United States Army officer, in 1918.

Feb 23, 2022 · The Piano soon gave way to the much more effective 20mm/80 Oerlikon, 40mm/60 Bofors, and various marks of updated DP 5-inch high-angle guns, the new trifecta. Kodachrome showing 5″/38 guns firing in gunnery practice, on board an Essex class aircraft carrier in the Pacific, circa 1944-1945.

Mar 18, 2019 · The .50-caliber Browning machine gun lacked the hitting power and range necessary to bring down the fast-moving, monoplanes of the day. The quad 1.1-inch gun (nicknamed the "Chicago Piano") proved to be equally disappointing and frequently jammed.

Multiple Pom-Pom 1.1 machine gun is used in deadly effect against low-flying aircraft. This gun the British affectionately call "The Chicago Piano." - Official U.S. Navy Photograph."