[ARC5] VHF SET

[Rich Post]

OK forgot the URL for the pic.

<https://photos.google.com/share/AF1QipP2zdAwQGlCA3s1dEXZeqB-
oZjWRmg0mm5QV-Uz9r-qUkDoqFvY3jWhYpRgHANUZA/photo/AF1QipN8WMh7p_
4Zm94U32fzD8NoxXRbrroC-gFsY5yG?key=R2JyT3FkVFRPbFJLV0JHOUI4YnhDVU83THVhOHF3>

On Fri, Dec 8, 2017 at 11:16 AM, Rich Post <kb8tad at gmail.com> wrote:

> Here's a bigger one at the Museum of Radio & Technology in Huntington
> WV.   About half the size of a refrigerator.   In protective case for
> obvious reasons.
>
> Rich KB8TAD
>
> On Fri, Dec 8, 2017 at 10:50 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>>
>>
>>
>>
>> *From:* J Mcvey
>>
>> Ø  What is the large glass bulb in the right hand side of the picture
>> used for?
>>
>>
>>
>> That is an early rectifier.  It’s full of mercury.  The two “handles”
>> contain the anodes and the pool of mercury, the cathode.  You tilted it
>> over to run the mercury up to the anode and cause a spark, which vaporized
>> some of the mercury and started the current flow, which vaporized more
>> mercury.  So you’ve got a rectifier without needing a heater to vaporize
>> the mercury.  I’ve seen one intact one in my life.  Most were destroyed to
>> recover the valuable mercury, since one might contain several pounds.
>>
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