A cross-section view, showing clearly and distinctly all the interior of a Submarine of the latest type. You get more information from this chart about the construction and operation of a submarine than in any other way. No details omitted - everything is accurate and to scale. It is absolutely correct in every detail, having been approved by naval engineers. All the machinery and devices fitted in a modern Submarine Boat are shown, and to make the engraving more readily understood all the features are shown in operative form, with Officers and Men in the act of performing the duties assigned to them in service conditions. THIS CHART IS REALLY AN ENCYCLOPEDIA OF A SUBMARINE. It is educational and worth many times its cost. Mailed in a tube for.............25 cents