Marek’s hand thrust the suggestion aside. “Not a bit of it. If you’d only get up physics a bit, I could give you an explanation of my Karburator1 in which the combustion takes place. It involves a whole chapter of advanced physics, you know. But you’ll see it downstairs in the cellar. I shovelled half a kilogramme of coal into the machine, then I shut it up and had it officially sealed in the presence of witnesses, so that no one could put any more coal in. Go and have a look at it for yourself—go on—go now! You won’t understand it, anyway, but—go down to the cellar! Go on down, man, I tell you!”

“Won’t you come with me?” asked Bondy in astonishment.

“No, you go alone. And . . . I say, Bondy . . . don’t stay down there long.”

“Why not?” asked Bondy, growing a trifle suspicious.

“Oh, nothing much. Only I’ve a notion that perhaps it’s not quite healthy down there. Turn on the light, the switch is just by the door. That noise down in the cellar doesn’t come from my machine. It works noiselessly, steadily, and without any smell. . . . The roaring is only a . . . a ventilator. Well, now, you go on. I’ll wait here. Then you can tell me . . .”

******

Bondy went down the cellar steps, quite glad to be away from that madman for a while (quite mad, no doubt whatever about it) and rather worried as to the quickest means of getting out of the place altogether. Why, just look, the cellar had a huge thick reinforced door just like an armour-plated safe in a bank. And now let’s have a light. The switch was just by the door. And there in the middle of the arched concrete cellar, clean as a monastery cell, lay a gigantic copper cylinder resting on cement supports. It was closed on all sides except at the top, where there was a grating bedecked with seals. Inside the machine all was darkness and silence. With a smooth and regular motion the cylinder thrust forth a piston which slowly rotated a heavy fly-wheel. That was all. Only the ventilator in the cellar window kept up a ceaseless rattle.