A timely topic treated photo-journalistically follows the 19 months of preparation, engineering, mock-ups and foundry work which led up to the words, ""Underway on atomic power"", wired by Captain Eugene Wilkinson, skipper of the Nautilus, to shore from the Thames River, near Groton, connecticut, January 17, 1955. The direct treatment of this dramatic weapon of war is a broad outline, rather than detailed reporting. There's a cross-sectional view of the Nautilus and a punchy impressionistic suggestion of the ingenuity and compression involved. (One pound of uranium produces as much heat as 2,300 tons of coal. The submarine chassis -- without the atomic engine -- cost $29,000,000.) Vocabulary and approach are beamed accurately for the target. High-voltage.