Still haven't been able to sort this out. Had a good look inside the Mk IV for interior lighting, but couldn't see any (except the modern lights rigged up by the museum). Must admit I didn't know exactly what I was looking for. But a German report of the interrogation of a captured crewman says that the man stated that there was electric lighting inside the vehicle.
I know the interior was painted white, but I can't imagine that enough natural light would have been admitted to enable the crew to see what they were doing, particularly the commander's visual instructions to the gearsmen. Haven't been able to see any in the Schneider and Saint-Chamond, either.
Does anyone know the score?
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