Could be. Had thought about that but discounted since the tube is plastic and durability would be limited. Still no sure why the tripod bolts on both ends?
A portrait focus chain. Free end goes in the camera's tripod socket, subject holds the black part under their chin while the photographer sets exposure, loads film holder, pulls dark slide, etc. -- then lowers their hand just before exposure.
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Look at the third picture down in the description and enlarge. There is a woman standing on a Rowi Chain Pod. the describe it as 180 cm but the pic shows 100
Ok got it!
Could have some application for point and shoot cameras with zone focus (once distances have been determined) or cameras with a tripod socket but no focus at all once closest focus is determined.
It's a camera-bullroarer. You screw one end of the chain into the camera, and use the handle end to hold it while you swing the camera around your head.
Somewhat supplanted by the Tarantino-style circular dolly shot as this was never really up to holding a full size movie camera.