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Maybe an 'anti cavorting chain', really a lanyard and belt arrangement to allow the wearer to move about without falling from the aircraft ?
This was the restraint for the observer in a Swordfish.
Cheers
Steve
Our modern idea/belief in "cradle to the grave security" was not prevalent in the early 1900s. One has only to look at the horrendous casualty figures for WWI land battles to see how cheaply soldier lives were held by both sides. So the occasional gunner tossed out of the aircraft was "regrettable" but not disastrous. Consider the RFC aircraft losses during Bloody AprilAfter all on the ground, thousands of men at a time were walking ( not running) across fields straight into machine guns, cannons, rifles and anything else the enemy chose to use, with only their faith and courage for comfort.