The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
From inside the book
Results 1-3 of 42
Page 277
... waves through the water which strike its hull and bounce back to their source . When converted into electrical waves , they reveal the distance and location of the submarine . To convert the sound waves into electrical waves precisely ...
... waves through the water which strike its hull and bounce back to their source . When converted into electrical waves , they reveal the distance and location of the submarine . To convert the sound waves into electrical waves precisely ...
Page 301
... waves vibrating billions of times per second . Such waves won't stay on wires . They must either be shot off into space as radio waves or captured and guided along the inside of a hollow conductor or pipe . Some day these extremely short ...
... waves vibrating billions of times per second . Such waves won't stay on wires . They must either be shot off into space as radio waves or captured and guided along the inside of a hollow conductor or pipe . Some day these extremely short ...
Page 303
... waves , it may be possible to send through the wave guide thousands of telephone con- versations at one time and many television programs . Some time , perhaps , wave guides may be used for long - distance telephoning , supple- menting ...
... waves , it may be possible to send through the wave guide thousands of telephone con- versations at one time and many television programs . Some time , perhaps , wave guides may be used for long - distance telephoning , supple- menting ...
Contents
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case | 325 |
In Manchuria Now By W Robert Moore | 389 |
Copyright | |
1 other sections not shown
Other editions - View all
Common terms and phrases
American Army Bell birds boats building built called carried Chief cloth color covered developed face farm feet fields fish flying Forces four Geographic Society Kodachrome ground half hand head Hills horses Indian Island Japanese John Lake land later light live looked miles Mount mountain moved NATIONAL GEOGRAPHIC MAGAZINE National Geographic Society natural nearly night once operations passed Photographer pigeon plant Plate President produce River road Robert rock ship side South sponge Staff stands steel stone streets telephone thousands tion took town train trees turned United Valley village walls Washington waves wind women