Telephone Switchboard Plug? WW2 Radio Equipment? HELP!!

[Indiana Digger]

Thanks for any help you can provide on this...


I don't even know where to start on a "Google Search"!



Thanks!

 

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[AU24K]

I'm thinking something like a "jumper capacitor?"
Each of the plugs are "mono" in style.
Hope this helps your Google search!

Best,
Scott

 

[Bramblefind]

You can try to search in Google Patents using that date. I've just looked briefly so far but it might be helpful to you-

http://www.google.com/patents?tbs=bks:1&tbo=1&q="sept. 24 1912" &btnG=Search Patents&scoring=2

 

[sniffer]

aviation style headphone plugs, one barrel for listening, one for transmit

 

[daroofa]

Looks like this might be it....for telephone switchboards.

Pat. 1,039,156

 

[Bramblefind]

Looks like this might be it....for telephone switchboards.

Pat. 1,039,156

Looks good!

 

[AU24K]

Looks like this might be it....for telephone switchboards.

Pat. 1,039,156

Looks good!

So, does the patent say what purpose it served?
What, if any, electronics are inside? Capacitors?

Best,
Scott

 

[Indiana Digger]

Looks like this might be it....for telephone switchboards.

Pat. 1,039,156

Daroofa,

HUGE props to you and everyone who helped on this! If you click on Daroofa's link, you will see that it looks just like what I have posted and the patent dates match! I'm marking this one as SOLVED!!

Thanks again!

 

[homefires]

That Jack is known as a 310 type.

It looks to be wired to be used to provide a Loop back from TX to RX.

http://www.flickr.com/photos/metrolibraryarchive/3172271332/

 

[Gunny71]

From the patent shown in the link provided by Daroofa