National Geographic : 1943 Feb
British Combine Enemy Airmen Fear the Music of the Pom-pom Naval men these days have a device which packs a terrific wallop for enemy bombers attempting to intervene in the operation of a convoy. It is the pom-pom, dubbed the "Chicago piano" because of the deadly staccatos which can be played on it with 1.1 -inch shells. British Combine The Destroyer Is theBackbone ofConvoy Protection They never rest, these ocean-going busybodies. Seldom are the little vessels in port longer than the time ittakes tooil up, check the guns, and take on ammunition. Looking after thedepth charges isanother oftheir jobs. Here they have an "ash can" on thehoist initsfiring cradle.