I found this interesting photo of a Prototype Thunderbolt!
Posted: Tue Mar 17, 2015 9:48 pm
I found this on eBay today!
The Siren Board
Discussion of Outdoor Warning Systems
https://www.airraidsirens.net/forums/
I found this interesting photo of a Prototype Thunderbolt!
Page 1 of 3
Re: Vintage siren photos thread
Posted: Tue Mar 17, 2015 10:04 pm
Thunderbolt prototype? That is very cool, and may be the earliest thunderbolt ever seen!
Re: Vintage siren photos thread
Posted: Tue Mar 17, 2015 10:05 pm
WHOA! Put that in its own thread. Do you see what that is?!
THATS THE PROTOTYPE T-BOLT SUSPECTED NOT TO EXIST.
Note the rounded blower and rotator covers.
THREE CHEERS FOR TRAINS AND SIRENS 1!!!
THATS THE PROTOTYPE T-BOLT SUSPECTED NOT TO EXIST.
Note the rounded blower and rotator covers.
THREE CHEERS FOR TRAINS AND SIRENS 1!!!
Re: Vintage siren photos thread
Posted: Tue Mar 17, 2015 11:42 pm
Is that a relief valve on top of the chopper cap?
Re: Vintage siren photos thread
Posted: Tue Mar 17, 2015 11:52 pm
TrainsAndSirens1 wrote:I found this on eBay today!
[picture removed]
OMIGOSH! SOOOCOOLPROTOTYPETHUNDERBOLTPICTEURE,WAVSGGXH(Translation: oh my gosh! That is a cool picture! Is it a prototype thunderbolt?)
uncommonsense wrote:WHOA! Put that in its own thread. Do you see what that is?!
THATS THE PROTOTYPE T-BOLT SUSPECTED NOT TO EXIST.
Note the rounded blower and rotator covers.
THREE CHEERS FOR TRAINS AND SIRENS 1!!!
I'm in total agreement. :thup:Re: Vintage siren photos thread
Posted: Tue Mar 17, 2015 11:58 pm
This is indeed "The rarest Thunderbolt known to man!!!" 
Re: Vintage siren photos thread
Posted: Wed Mar 18, 2015 12:08 am
Heh, I was wondering how long before somebody else would find this and post it. What's even cooler is the man at the right of that primitive RCM setup is none other than the "father" of the Thunderbolt (and many other early Federal siren designs) himself, Earl Goswiller. I believe the man to his left beside the controls is the assistant Civil Defense director for Minneapolis, if I recall correctly. It would really be something if this early prototype still existed, but the chances of that being true are slim to none.TrainsAndSirens1 wrote:I found this on eBay today!
(image removed)
Re: Vintage siren photos thread
Posted: Wed Mar 18, 2015 1:52 am
Looks like he has the chopper hooked up to a variac. Guess they were showing off its abilities to run at various pitches.
Re: Vintage siren photos thread
Posted: Wed Mar 18, 2015 2:36 am
Does anybody know where this picture was taken? In the background, i see a tower that looks like the foshay Tower (an early tower in Minneapolis).
Re: Vintage siren photos thread
Posted: Wed Mar 18, 2015 2:45 am
josh555 wrote:Does anybody know where this picture was taken? In the background, i see a tower that looks like the foshay Tower (an early tower in Minneapolis).
murrfarms wrote: I believe the man to his left beside the controls is the assistant Civil Defense director for Minneapolis, if I recall correctly.