Directional ex-Class IA AMs

Dave Doherty
Thu Dec 17 16:37:22 EST 2009

Hi Bob-

The plates on the final tubes were surrounded by insulated jackets that were 
kept full of water. The hot water was pumped out to the pond, where it was 
sprayed to cool it further. Keeping the water clean in an open system like 
that must have been a real chore, and the combination of running water and 
high voltage is nothing short of scary.


From: "Robert S Chase" <>
Sent: Thursday, December 17, 2009 4:15 PM
To: <>
Subject: Re: Directional ex-Class IA AMs

> I doubt very much that the "fountain" in the foreground 
> was either 
> decorative (too much iron pipe) or a waste water treatment plant so my 
> guess is that it was a water cooling sink for the transmitter. (AC not 
> being a big thing in the 40's but still a possibility.) How did it work?

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