Re: Pressurized nitrogen tank capacitor for big VTTC?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net> 

Terry and Scott,

Exactly - and gas capacitors are used today in high voltage laboratory 
capacitors and capacitive dividers. The gas is often pressurized dry 
nitrogen (no greenhouse gas worries and cheap) or SF6. Scott - try 
searching for "gas capacitor" - you should have better success.

Best regards,

-- Bert --
-- 
--------------------------------------------------------------------
We specialize in UNIQUE items! Coins shrunk by Ultrastrong Fields,
Lichtenberg Figures (electrical discharges in acrylic), & Scarce OOP
Technical Books. Stoneridge Engineering -- http://www.teslamania-dot-com
--------------------------------------------------------------------

Tesla list wrote:
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>Hi Scott,
>I am sure these are like the pressure SF6 caps today.  They are just 
>trying to raise the breakdown voltage while keeping the Q very high.
>Oil and such adds loss, but just adding air....  This may have been before 
>Joe Jennings figured out vacuum caps...
>Cheers,
>         Terry
>At 04:31 PM 3/7/2004, you wrote:
>
>>One of my dad's old industrial electronics books (Electronics for Industry,
>>W.I. Bendz, 1947) has several chapters covering high power vacuum-tube
>>oscillators for induction-heating applications.
>>
>>Shown in a photograph on page 247 is a 10 KW vacuum-tube oscillator
>>featuring a "tank capacitor (pressurized nitrogen type with high voltage
>>terminal at bottom)".
>>
>>This appears to be a metal cylinder about 10 inches in diameter by 12 inches
>>long, with flat end plates, and a conventional 2" diameter pressure gage
>>sticking out the top. Some sort of smaller cylindrical can is projecting out
>>the bottom, that may be the high voltage terminal referenced in the text.
>>
>>The rest of the photo shows what might pass for the makings of a very large
>>VTTC, with a giant air-cooled glass/metal triode, very large open frame tank
>>coil, etc.
>>
>>But, what is a "pressurized nitrogen capacitor"?
>>
>>Does anyone have any insight into the internal construction, and the
>>operating pressure?
>>
>>Web searches for "pressurized nitrogen capacitor" have yielded nothing.
>>
>>Regards,
>>Scott Hanson
>
>.