From: Judy Seigel (jseigel@panix.com)
Date: 03/29/02-01:20:33 AM Z
On Fri, 29 Mar 2002, John Campbell wrote:
>
> Judy--
>
> Your array was wired in parallel, I would assume (given that the whole thing
> worked, even with "out" bulbs), and ballasts matched? Resistance
> differentials among the tubes would explain the four tube uneven
> results-confirmed by moving the tubes. I would also be curious as to the
> grounding of the total array.
>
> Thanks and best wishes,
> John
I don't know why you guys insist on giving me an electrical array beyond
my personal needs, let alone my expertise.
Each strip has its own own little ballast & its own little plug, because
each is an independent fiefdom. Each freestanding unit of either one or
two bulbs has its own plug, switch, ballast, grounding, starter, etc. Each
plug goes into its own little receptacle on a power strip which runs
through a Gralab so I can time and turn on & off as one.
What/why/how are "resistance differentials."???? (You fellas may know too
much.) But I feel I can say now without fear of contradiction, they are
parallel!
DIAGRAM:
==========================
==========================
==========================
==========================
==========================
==========================
==========================
==========================
==========================
best,
Judy
>
>
> Part 3:
>
> Linguists are so literal. Rhetoricticians-now, there is right thinking!
>
>
> Night, all!
> --John
>
>
> http://www.photogecko.com/
> Home of The Gecko UV Light Box
> "Get The Gecko!"
>
>
>
> -----Original Message-----
> From: Judy Seigel [mailto:jseigel@panix.com]
> Sent: Thursday, March 28, 2002 11:41 PM
> To: alt-photo-process-l@skyway.usask.ca
> Subject: Re: Measuring
>
>
> On Thu, 28 Mar 2002, Sandy King wrote:
>
> > Judy,
> >
> > As I understand from what you have written about your light source it
> > has a mix of different tubes, is wired in part parallel, in part
> > series, and the spacing of the tubes is not uniform? Such a unit may
> > give inconsistent results depending on where the testing is done.
> >
>
> Really Sandy, I've said to the point of tedium all week (almost as bad as
> S&G) that the extra spacing of the tubes was only for a test that was done
> & gone months ago.... Normally all bulbs are on and as close as they can
> be.
>
> As for part parallel, part series -- I don't know where that's from, but
> you force me to reveal that I don't know what it means. As I said several
> times, showed in photographs & described ad nauseam, my bulbs are on
> fixtures, readymade from .... well, some from my son's homegrown, um,
> condiments, 25 years ago, and some from Garber & Sons, the local hardware
> store. The only IRREGULARITY is that one of the fixtures, the last one in
> the row (& not for that matter anywhere near the area lighting the corrent
> tests) is broader than the others -- And, as I also said, this caused
> absolutely no un-evenness in the print. Nor is this surprising, given that
> a much GREATER gap (alternate bulbs covered) caused no irregularity
> either.
>
> True, there HAD BEEN an irregularity, but it was corrected by switching
> the bulbs... as I showed with the scan in P-F #7, p. 40. If you care to
> explain why that worked, be my guest... But, explanation or no, the light
> is even.
>
> True, the setup is very low tech... (Shown page 21, P-F #6.) As is the
> proof cited. I trust that doesn't rule it out. The light is in fact more
> even than the light from the metal halide bulb in my late plate burner,
> and needless to say than from single bulbs of any sort.
>
> Meanwhile, my observation is that Alberto's observation that at least half
> of any unevenness is from the coating sounds about right. And I also
> suppose that double coating would go a long way toward overcoming that...
> I DIDN'T double coat because the point was to SHOW whatever unevenness
> could possibly be shown.
>
> And for those listening in who don't feel like wiring & ballasting &
> grounding, my experience here, with normal supply sources (I do NOT have a
> Home Depot within reach & I count my travel time as an expense), it's more
> expensive to buy ballasts & other parts & wire your own -- parallel or
> serious, than to buy ready to use. Or I should say ALMOST ready to use,
> lest someone think I put on the plugs... Electricity is not one of my
> talents. But vision is. Tone was as even as possible with single coat by
> hand.
>
> Judy
>
>
>
This archive was generated by hypermail 2b30 : 04/10/02-09:28:55 AM Z CST