The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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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
Sponge Fishermen of Tarpon Springs Florida By Jennie E Harris | 119 |
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case | 325 |
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