122 Miracles Ahead! 



mination of the distance and direction of its target and the 

 nature of the object it has spotted. 



The lessening of the U-boat menace in recent months can 

 very largely be attributed to the increased use of Radar detect- 

 ing devices. Time was when the U-boat raider, lying on the 

 surface on a pitch-black night, recharging batteries, was as 

 safe as he'd be under the surface. Now the Radar opera- 

 tor can spot the surfaced U-boat, even though the night 

 hides him or a blanket of fog covers him, and direct the bomb- 

 ing plane unerringly to the target. The U-boat never sees the 

 plane approaching may not even hear it. Without warning, 

 bombs whistle through the black night and one more U-boat 

 goes down for the last time. 



Just as Radar, supersleuth, helped win the Battle of Brit- 

 ain, so it is helping now to win the battle over the U-boat 

 menace. What of the peacetime uses of this wartime miracle? 

 The editors of Newsiveek summarize its possibilities thus: 



"The development is significant for peace as well as war. 

 It promises a peacetime future in which collisions at night 

 between airplanes, or between airplanes and mountains, will 

 be impossible. Pilots can also take off from and land on fog 

 bound airdromes with perfect security. There will be no 

 such necessity as 'blind flying.' 



"Ships will be able to enter and leave harbors despite fogs 

 that now make them helpless. And the perfection of 'beam 

 communications' or the sending out of extremely narrow 

 channels of electric signals, to be picked up by receivers 

 aboard airplanes, will aid the navigation of every amateur 

 pilot." 



Radio-Frequency Heating 



One of the most dramatic developments in manufactur- 

 ing today is the widespread application of R.F., or radio- 



