Radii for describing the arcs for the bow and stern of the hull are not given, because after you have located the points for the beginning and end of these curves, as shown, you can easily draw them free-hand. The Hull and Upper Decks (A), which are made in one piece. The simplicity of the work in making this mechanical toy will surprise you. Finally, by driving the contact point forcibly against the foot of the bath tub, or against an obstruction placed on the tub bottom, the trigger may be sprung, and the boat, relieved of its weight, will rise to the surface.įig. With a stream of water from a bath-spray forced against the stern, the boat may be propelled forward, and by directing the force of the stream against different portions of the boat you can cause the boat to go through all sorts of maneuvers, even to rising nearly to the surface. Then a gentle submersion to the tub bottom will not bring about the springing of the trigger, and the boat will remain upon the bottom. Instead of having the submarine dive, discharge its weight, and instantly rise to the surface, you can make the trigger mechanism less delicate, so that it will not be sprung by slight contact. To make the boat dive again, it is but necessary to attach the tin can and reset the trigger. Relieved of its ballast, the submarine rises to the surface. Catch J is sprung out of the way by rubber-band K, trigger E is sprung out of the way by rubber-band G (see dotted lines in Fig. When the submarine reaches the bottom of the bath-tub - a tub furnishes a good "zone" for operations - nail F in trigger E comes in contact with the tub bottom with sufficient force to throw trigger E out of position and release catch /. Can D is of sufficient weight when filled with sand, to sink the submarine. Trigger E is held by catch J, which slips into a notch cut in the edge of E. One end is supported upon a brad, the other end upon the trigger E. The central section D is a tin can filled with sand, for ballast. (See photograph facing ) diagrams of Figs. Side Elevation of Completed Toy Submarine Shown in Fig. The Mechanism is best understood by referring to theįig. This toy submarine dives, then returns to the surface. A Toy Submarine that Dives then Rises to the Water's Surface (See Chapter 11 (A Toy Submarine)). 269, and an end elevation is shown in Fig. 268, on the page facing page 129, a side elevation is shown in Fig. A photograph of this toy is shown in Fig. The toy submarine described on the following pages is a model recently devised by the author.
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