Some more classic pictures

[Welder guy]

 

[Welder guy]

 

[67newport]

still in business

https://www.donalsoncdjr.com/

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

•Acoustic location was used from mid-WW1 to the early years of WW2 for the passive detection of aircraft by picking up the noise of the engines.

•It relied on listeners picking up any sounds or vibrations produced by the object.

•The air-defense instruments usually consisted of large horns or microphones connected to the operators’ ears using tubing.

•They earned the nicknames "war tubas" or "sound trumpets"
•

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[67newport]

 

[Welder guy]

 

[Welder guy]

 

[Welder guy]