One of our members donated this device to Explorer. It consists of a frame attached to a Venturi containing an impeller connected to two worm drives. The worm drive is attached what presumably was a recording device. A bourdon tube is attached for reasons yet to be gleaned. It seems to have a depth limit of 210m inscribed and looks like it might have been an instrument to measure sub sea currents. I’m betting John Dunn will know.
And of course he does.
Ze next question Meester Dunn maybe be a leetle treekier.