How to conceal the power source from Mr. Gordon's ancestor?

Is Mr. Gordon distracted by the landlady?

If not, talk to him until she calls him.

When he turns his back to talk to her, this is your opportunity to hide the power source.

Where, though?

See that uncorked bottle on the table?

If you read Mr. Gordon's ancestor's comments on the paper next to it, it doesn't seem likely he will want to sample any more of that vintage.

The power source is vaguely cork-like in shape, isn't it?

Try the power source on the BOTTLE.

The bottle is now power-source-corked and unobtrusively placed back in the rack.