Sinopsis

Johnny Thompson started, then stared with dilated pupils at a spot on the aluminum casting before him. The spot, a jagged notch left by imperfect work in the foundry, turned first a dull red, then a bright red, then a glowing white. Mechanically his hand touched the valve of his oxy-acetylene torch. Yes, it was as he had believed, the acetylene valve was closed. The oxygen valve was open, it was true, but the drum which had contained oxygen under a thousand pounds pressure was empty. In fact, he was waiting for the arrival of a new drum.