411 REFERENCE · Wiktionary
Gosport tube
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
It was invented by flying instructor Robert Raymond Smith-Barry at the School of Special Flying he opened at Gosport in 1917.
Noun
en aviation historical A speaking tube used for communication between the seats of early open-air aircraft.
en Gosport