Mmmmmmmmm ....
Now I could be wrong on this .... but as I have a mind that retains all manner of not very useful info and very little useful stuff I will have a go ...
I think you will find this piccy is of a rig that was used during the fliming of the movie "Catch 22" (or similar) ... when the director wanted to easily film a 360 deg panorama from in the centre of a B25 formation.
The idea was to suspend the camera man from this rig which then allowed the Allouette to fly around as part of the formation being able to do that task giving an uninterupted 360 take ....
Jeeze I hope i'm right or I'm gunna get some sh*t eh!
Cheers