apparently this gadget was used to measure the water temperature in the river, and the height of the tide, not used now that modern technology has taken over, but one of those odd little thing you could pass every day and never notice
my old man used to take people on guided walks around London, its under bodiceas arse if you want to find it
Should have had his/her license lifted at the previous renewal period. 80 is too old to let someone drive on crowded public roads, which describes most of the UK road network. Too late now; the Grim Reaper got him.