Japanese early warning systems---pre radar.
- emgcr
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Japanese early warning systems---pre radar.
Here is an amusing sight. Might they make wonderful gramophone horns if used in reverse ?! Not exactly exponential...............
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- The Japanese War Tuba used to locate enemy aircraft before the invention of radar. Circa 1930..JPG (59.97 KiB) Viewed 1252 times
- ImperialGuardsman
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Re: Japanese early warning systems---pre radar.
How did they work? Did they measure sound or pressure waves in order to determine if an aircraft was in the sky?
ImperialGuardsman
OTAPS (Oregon Territory Antique Phonograph Society) Member
~Also a member of Suscipe Domine and The High Road forums~
OTAPS (Oregon Territory Antique Phonograph Society) Member
~Also a member of Suscipe Domine and The High Road forums~
- De Soto Frank
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Re: Japanese early warning systems---pre radar.
The carriages look like they were repurposed from Model T Ford running-gear...
Even Old Deaf Tom should have been able to hear with an ear-trumpet like these !

Even Old Deaf Tom should have been able to hear with an ear-trumpet like these !


De Soto Frank
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Re: Japanese early warning systems---pre radar.
Apparently it collected low frequency sound, and piped it to an earpiece that somebody would listen to. They would pick up the sound from a bomber's engines.ImperialGuardsman wrote:How did they work? Did they measure sound or pressure waves in order to determine if an aircraft was in the sky?
- emgcr
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Re: Japanese early warning systems---pre radar.
Yes, just like a giant magnifying ear trumpet. In the UK, we had (and still have) equivalent concrete structures along the coast facing Holland, Germany, Belgium and France for similar purposes.ImperialGuardsman wrote:How did they work? Did they measure sound or pressure waves in order to determine if an aircraft was in the sky?
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Re: Japanese early warning systems---pre radar.
Armies tried a remarkable array of acoustic listening devices: https://www.google.com/search?q=army+li ... 66&bih=643
- emgcr
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Re: Japanese early warning systems---pre radar.
Here are some of the English "sound mirrors".
http://www.andrewgrantham.co.uk/soundmi ... ons/denge/
http://www.andrewgrantham.co.uk/soundmi ... ons/denge/
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Re: Japanese early warning systems---pre radar.
Then in 1964, Dr. Amar G. Bose, professor of electrical engineering at the Massachusetts Institute of Technology looked at this picture and decided to turn this into a home audio system... the birth of the acoustic wave technology. 

"The phonograph is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife
Thomas Alva Edison - Comment to his assistant, Samuel Insull.
"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife