Page:Popular Science Monthly Volume 91.djvu/74

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��Popular Science Monthly

���According to chemists' reports the solu- tion does not injure the inner tube in the least, but is, on the other hand, a preserva- tive of rubber. Under-inflation is the cause of the majority of tire troubles. With the new solution the proper air pressure is maintained at all times in the inner tube.

���A small quantity of the solution is forced into the tire. When the wheel re- volves, the fluid spreads in a thin film over the pores of the inner lining

��A Solution Which Promises to Solve Some Tire Troubles

A SOLUTION which is injected into the inner tube of an automobile tire through the stem is said to keep the tire at normal inflation and to make it practically puncture proof. The solution lies in a fluid state at the bottom of the tire, occupy- ing only six per cent of inner space, except when the car is in motion, when centrifugal force carries it around the tire in a thin film, thereby sealing all porous places that cause slow leaks. The fifty or eighty-pound pres- sure forces the solution into every infinitesimal open ing where air leaks out, and at once seals it.

��On Land a Submarine Travels at Tortoise Speed

O her great surprise, the U. S. Sub- marine H-3, of the Pacific division, woke up one day to find herself high and dry on the sands of Samoa Beach, California. It was not exactly the proper place for a perfectly respectable subma- rine, and plans were immediately devised to launch her. The best launching place was Humbolt Bay, nearly a mile distant, where the land goes down rather ab- ruptly from the shore. So the subma- rine was jacked up and laid upon a wire cradle formed between two huge logs. The cradle and its burden, wheeled upon small logs as rollers, were then moved slowly forward by hauling on a block and tackle. This is the first authentic report of a bona-fide submarine taking an overland journey.

As a land animal, however, the sub- marine is not very spry — she makes about one hundred and fifty feet in an hour. Under water she travels at from six to eight miles an hour. Hereafter she will prob- ably be more careful about keeping away from shore and out of the path of breakers and inrushing tides.

���When the U. S. Submarine H-3 became beached, she had to be jacked up on a massive log cradle and pulled on four sets of huge rollers to a suitable launching place nearly a mile distant

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