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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. THE CONSTRUCTION OF SUBMARINE BOATS. THE clearest way of showing the ideas and principles which ought to be the guiding ones in such a construction, is...
Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER III. THE CONSTRUCTION OF SUBMARINE BOATS. THE clearest way of showing the ideas and principles which ought to be the guiding ones in such a construction, is to simply describe in detail a complete design, all along giving the reasoning why such or such an arrangement has been adopted. This will illustrate the many practical difficulties of the problem, and will in the most positive way answer the numerous questions which naturally occur to every one who takes the trouble to think over the matter. Before describing the details of the design, it will be well to sketch out its main features, of which the accompanying sketch (Fig. 5, Plate II.) is an illustration. The essential point of this vessel is that it is able to dive down at any time, and continue its course under water for a considerable distance. This is attained by giving the vessel two different modes of propulsion, namely, steam and electricity. The steam-power enables it to move along the surface of the water, just as would do most of ourmodern men-of-war, if we take away their light upper part. When the vessel dives down, the electric motors are thrown into gear, and thus she may go on under the water, as long as there is any electricity in her electric storage-cells. The cells may be re-filled by using the ship's own steam- engine as motor, and the electric machines as dynamos. The transverse section is throughout the vessel an oval with its greatest axis horizontal. This shape has been adopted partly because it is favourable as regards strength, on account of the curved surface, and partly because it gives small draught of water. The vertical axis has been made just big enough to give the necessary head-room, and thus reduce the depth to a minimum ; and the breadth is what is required to give th...
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