The next pull of the lever reveals a small circular room with a pool in the centre. Edmond labels it, a short wait, pull the lever again. As before, somewhere a bell rings, machinery grinds, the room shakes. This time the pool room is replaced with a room with another lever - it looks like the first one you encountered, with two tiger statues in niches. Just to make sure, Edmond labels it and Mhairi pulls the lever again. Back to the corridor with the disturbing murals.
In all, after some experimentation, it seems that there are four possible configurations that follow sequentially.
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Images will follow shortly, I thought I had them on a flash drive but I don't.
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