"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]
"Lawyers of the past, haughty, pleading, beheld pass from the consolidated taxing office to Nisi Prius court Richie Goulding carrying the costbag of Goulding, Collis and Ward and heard rustling from the admiralty division of King's bench to the court of appeal" (U10.470)
"an elderly female with false teeth smiling incredulously and a black silk skirt of great amplitude.
— See? he said. See now the last one I put in is over here: Turns Over. The
impact. Leverage, see?
He showed them the rising column of disks on the right." (U10.473)

An ad from Pearson's Magazine 1905, suggesting false teeth were a precious commodity!
"- Smart idea, Nosey Flynn said, snuffling. So a fellow coming in late can see what turn is on and what turns are over. " (U10.479)

Eamonn found the patent application #27,617 titled "Improvements in Programme Indicators for Theatres of Varieties, Music Hall and the like", for an invention by Thomas Henry Rochford (19 Wellington Quay, Dublin, Engineer), dated 1908, detailing its construction, mechanism, and usefulness.
"- See? Tom Rochford said.
He slid in a disk for himself: and watched it shoot, wobble, ogle, stop: four. Turn Now On.
- I'll see him now in the Ormond, Lenehan said, and sound him." (U10.481)
"One good turn deserves another.
- Do, Tom Rochford said. Tell him I'm Boylan with impatience.
- Goodnight, M'Coy said abruptly, when you two begin..." (U10.484)
"Nosey Flynn stooped towards the lever, snuffling at it.
— But how does it work here, Tommy? he asked.
— Tooraloo, Lenehan said. See you later.
He followed M'Coy out across the tiny square of Crampton court.
— He's a hero, he said simply.
— I know, M'Coy said. The drain, you mean.
— Drain? Lenehan said. It was down a manhole." (U10.488)
"They passed Dan Lowry's musichall where Marie Kendall, charming soubrette, smiled on them from a poster a dauby smile." (U10.495)

another charming soubrette with a dauby smile...
"Going down the path of Sycamore street beside the Empire musichall Lenehan showed M'Coy how the whole thing was. One of those manholes like a bloody gaspipe and there was the poor devil stuck down in it, half choked with sewer gas. Down went Tom Rochford anyhow, booky's vest and all, with the rope round him. And be damned but he got the rope round the poor devil and the two were hauled up.
- The act of a hero, he said." (U10.497)
"At the Dolphin they halted to allow the ambulance car to gallop past them for Jervis street.
- This way, he said, walking to the right. I want to pop into Lynam's to see Sceptre's starting price. What's the time by your gold watch and chain?
M'Coy peered into Marcus Tertius Moses' sombre office, then at O'Neill's clock.
- After three, he said." (U10.504)
"Who's riding her?
- O. Madden, Lenehan said. And a game filly she is." (U10.510)
"While he waited in Temple bar M'Coy dodged a banana peel with gentle pushes of his toe from the path to the gutter." (U10.512)
"Fellow might damn easy get a nasty fall there coming along tight in the dark." (U10.513)
"The gates of the drive opened wide to give egress to the viceregal cavalcade." (U10.515)
"- Even money, Lenehan said returning. I knocked against Bantam Lyons in there going to back a bloody horse someone gave him that hasn't an earthly. Through here.
They went up the steps and under Merchants' arch." (U10.517)
"A darkbacked figure scanned books on the hawker's cart.
- There he is, Lenehan said.
- Wonder what he's buying, M'Coy said, glancing behind.
- Leopoldo or the Bloom is on the Rye, Lenehan said.
- He's dead nuts on sales, M'Coy said. I was with him one day and he bought a book from an old one in Liffey street for two bob." (U520)
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