Strapping-in aircrew 1914-15

[clive_hughes]

Hi folks,

Something I've not seen explained as regards safety of air crew of British fighter/observation planes of the early War era is how were they strapped into the seats in their open cockpits?  They will have needed enough freedom to operate controls/guns or peer over the sides, but still be tightly enough secured that they didn't slip out during aerobatics of whatever sort.

There may be a range of answers, though what was primarily on my mind was the sort of 2-man "pusher" aircraft used by 5 Sqn. RFC in 1915, with the observer/gunner out in front of the pilot. 

Cheers,

Clive