Well I don’t have the Buzzer Al is looking for, but looking up the MK IV, this is a throwback to the days of landline telegraph! Which dates back to before the Civil War. A single wire aloft, using the earth as the return. A manual for it is available here:

https://vdocuments.net/fullerphone-mk-iv-1939-stv3-p21.html?page=32

Very cool Al, hope you can find the buzzer.

73, Howie WB2AWQ

Sent from Mail for Windows

From: Al Klase
Sent: Tuesday, May 17, 2022 7:21 AM
To: [email protected]
Subject: [Milsurplus] Fullerphone - Longshot

Gang,

Might anyone have a "Buzzer F" for a Fullerphone Mk IV?  A unit have been donated to the Radio technology Museum and I'd like to get it going just for fun.  Our buzzer is missing one of it's contacts, so a damaged unit might take care of the problem.

Look HERE if you're curious.

Just so you know:

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There would be a graphic here

if this reflector were set up properly!

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Thanks,
Al

--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/