142 Miracles Ahead! 



wavers, and then stops on the center mark of the dial. He's 

 on his glide path now. Nothing to do but hold the plane there. 

 Just as a child slides down a sliding board, the pilot glides 

 down an invisible incline, made by a radio beam, and sets his 

 plane down on the runway as smoothly as a motorist would 

 drive into his familiar driveway in broad daylight. 



Today the total output of perfected blind-landing equip- 

 ment may go to our military needs. But tomorrow such devel- 

 opments will add to the safety of civilian flight. 



Today the absolute altimeter warns our fighter planes of 

 just how high aboveground they are. Tomorrow civilian 

 planes will be equipped with this lifesaving device, and colli- 

 sions with mountains will be prevented. 



Today the radio detector, Radar, "sees" a submarine a hun- 

 dred miles away, and directs the bomber on its course to sink 

 the submarine. Tomorrow that same radio detector will enable 

 a searching plane to find a disabled vessel or a lifeboat a hun- 

 dred miles away, at night, and will direct the searchers to the 

 spot. 



The exigencies of war have compelled the best brains of 

 the radio and television fields to think faster, harder, more 

 carefully, than ever before. Future developments in these 

 fields will be based upon the phenomenal achievements of the 

 past thirty months. 



A Word about Frequencies 



Since radio plays such a vital part today, and is destined to 

 play even a greater part in our peacetime world of tomor- 

 row, it behooves us all to have some idea of "just how radio 

 works." Hence the following explanation is offered to explain 

 it briefly, in its simplest terms. 



When we speak of sending music or pictures by electricity 

 through wires or through space, we do not mean that the 



