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Re: Capacitor C/Peek
>>From Benson_Barry%PAX5-at-mr.nawcad.navy.milWed Oct 30 21:43:23 1996
>Date: Wed, 30 Oct 1996 06:25:00 -0400 (EDT)
>From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil
>To: tesla-at-poodle.pupman-dot-com
>Subject: Re: Capacitor C/Peek
>Clark and Ryan? What is the citation for this paper?
>Sounds interesting.
>Barry
> ----------
<big snip for Chip>
I (Robert Stephens) wrote:
>BTW, you used 20 kV/inch for your voltage guestimation. According to
>the famous paper by Clark and Ryan the value is more like 48-52
>kV/inch between sphere gaps. Trouble is, all sorts of factors
>influence this measurement to make it almost meaningless in the field
>(pun intended!). Carefully controlled conditions must be set up to hope
>for any accuracy when attempting to measure voltages by spark length.
The paper is called 'Sphere Gap Discharge Voltages At High
Frequencies', by J. Cameron Clark and Harris J. Ryan. Presented at
the 31st Annual Convention of the American Institute of Electrical
Engineers, Detroit, Michigan, June 24, 1914, under the auspices of
the Electrophysics Committee.
ABSTRACT.
'The paper describes a series of experiments made by the authors to
determine the values of steady high-frequency, high-voltage currents
required to discharge between seven inch copper spheres in air, at
ordinary temperatures and barometric pressures. A 15-kw, arc
generator was used as the source of high-frequency sustained high
voltage, and the apparatus employed in securing and measuring
currents of 123,000, 255,000 and 612,000 cycles is described in
detail.
The sphere gap standard consisted of electrolytic copper spheres
mounted on the ends of brass tubes in treated wooden frames, and the
gap lengths were accurately determined by means of calipers and
micrometer screw or steel scale.
The results obtained are given in Tables II and III and are also
charted in curves I and II, Fig.5. The 123,000-cycle values show a
right-line relation between sphere gaps and discharge voltage, which
line, when extended, passes through the origin. The high-frequency
voltages are almost uniformly 4.5 kv. below the 25-cycle voltages
observed by Chubb and Fortescue.'
end Abstract.
rwstephens