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The laboratory was littered with the usual disorderly-order of similar apartments. In the middle of it on a big, bare, acid-stained deal table there stood a glass tank full of water, something like an aquarium tank, but the glass walls were made of the best white plate. The water with which it was filled had a faint greenish hue and looked like seawater. At one end of it there was a curious looking apparatus. A couple of boxes, like electric storage batteries, stood on either side of a combination of glass tubes mounted on a wooden stand so that they all converged into the opening of a much larger tube of pale blue glass. Fitted to the other end of this was a thick double concave lens also of pale blue glass. This was placed so that its axis pointed down towards the surface of the water in the tank at an angle of about thirty degrees.
-"Well, Wallace," said Sir Wilfred as his son locked the door behind them, "what's this? Another of your wonderful inventions? Something else you want me to put before my lords of the Admiralty?"