Measurements using field probe

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Measurements using field probe
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 30 Jun 1998 22:55:31 -0500
• Approved: tesla-at-stic-dot-net

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From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, June 30, 1998 12:13 AM
To:  Tesla List
Subject:  Re: Measurements using field probe

I must disagree with this statement:

> From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent:  Monday, June 29, 1998 8:08 AM
> To:  Tesla List
> Subject:  Re: Measurements using field probe
> 
> to: Bert
> 
> It would not be reasonable to assume the 144 Ohm resistance for the 420 BPS
> of operation.  This value would only be true for the first few firings of
> the cap as the "hot" resistance of the bulb is considerably less than its
> initial "cold" measured DC resistance.  After a few seconds this value
> would be lower.

In fact the filament has a positive temperature coefficient. If its
resistance didn't increase as it got hotter but decreased instead, it
would draw ever more current until it popped.

Malcolm
<snip>

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