58 



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 



