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It's in the first verses of both songs. Verse one of Part One:
There are unsmiling faces and bright plastic chainsVerse one of Part Two:
And a wheel in perpetual motion
And they follow the races and pay out the gains
With no show of an outward emotion
There are unsmiling faces in fetters and chainsSince the whole album is about gambling and casinos, I thought at first that that "wheel in perpetual motion" was a roulette wheel. But then I realized that it could also be the wheel of fortune. I first learned about this in my Shakespeare class when we were going over tragedies. The idea is that people are on a wheel that's turned by fortune, so at one point, someone might be on the top of the wheel and in good fortune, but then the wheel would turn, and they'd be somewhere else is worse fortune.
On a wheel in perpetual motion
Who belong to all races and answer all names
With no show of an outward emotion
Judging by the context in "The Turn of a Friendly Card (Part Two)," specifically the "faces in fetters and chains / On a wheel," the wheel of fortune makes more sense than a roulette wheel. The song itself deals with luck and chance (fortune) more than roulette. Cards are mentioned in the lines "your whole world depends / On the turn of a friendly card," and while I don't really know anything about roulette, I do know that cards aren't used.
Still, within just that line, the "wheel in perpetual motion" is an ambiguous image that could be a roulette wheel or the wheel of fortune.