Error in this depiction of a Stirling engine?

AI Thread Summary
The discussion revolves around the depiction of a Stirling engine in a set of physics lecture notes, specifically questioning the labeling of the phases in the PV diagram compared to the accompanying illustration. The user notes that the phases of isothermal expansion and compression appear misaligned with the expected isochoric states, suggesting that the labels may be shifted. There is confusion about whether the positions of the piston in the illustration correspond correctly to the phases described. The user seeks clarification on the accuracy of the representation in relation to the PV diagram. Overall, the inquiry highlights a potential discrepancy in educational materials regarding the Stirling engine's operation.
greypilgrim
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Hi.
In my (German) physics lecture notes, I found this depiction of a Stirling engine:
Stirling.PNG

According to the text, it should be
A: isothermal expansion
B: isochoric cooling
C: isothermal compression
D: isochoric heating

This seems correct for the PV diagram, but strange in the illustration on the right. Shouldn't A and C be (approximately) isochoric since that's where piston A (green) is at dead centre?
 
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It looks like the labels are shifted by one phase. B in the PV diagram is A in the sketch and so on.
 

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