WANDERING ROCKS

"Tom Rochford took the top disk from the pile he clasped against his claret waistcoat.
- See? he said. Say it's turn six. In here, see. Turn Now On.
He slid it into the left slot for them. It shot down the groove, wobbled a while, ceased, ogling them: six.' (U10.465)

As discovered by Eamonn Finn (and reported in the JJ Broadsheet June 2008) this is the device being shown.

[Image courtesy of Eamonn Finn]