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<title>Light fixtures</title>
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<div class=Section1>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Mark:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks for your reply. The word “Forced” was not a good
choice in my original post. “Makes available” would probably be better.
I just know that if I were in a more extreme climate where humidification were
essential I would probably try to avoid the constant tank filling during the
summer if possible. Filling the tanks, changing the pads, etc. is a lot of
work! <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We have a couple of rooms where excess humidity is sometimes a problem
but for the most part our building stays quite good. I do worry more about
high humidity than low. Most of our grand pianos are Steinways and since they
dry their panels so much I’ve always thought they did well in the
dryness. When humidity is high the boards tend to develop compression ridges
which then crack the next time the humidity goes down. I’ve always
thought that if we keep them on the drier side, they don’t develop as
many problems. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We did get down to 11-degrees (F) once this year and that’s
pretty rare but the temperature was back up long before our building had a chance
to react in any way. I know that 11-degrees would be a treat for you in
January! <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I do think someone should do more research on the idea of having the
system “off” when the relative humidity is in the correct zone. I
also realize that would probably demand humidistats with much higher accuracy
than what is currently available.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>dave<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'>David M. Porritt</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><a href="mailto:dporritt@smu.edu">dporritt@smu.edu</a></span></font><o:p></o:p></p>
</div>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Mark Cramer<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, June 09, 2006 2:16
PM<br>
<b><span style='font-weight:bold'>To:</span></b> College and University
Technicians<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [CAUT] Topping up the
tank</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Hi Dave,</span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>you raise a good
point, I'm no authority, but will share what I think I know about overlapping
thresholds, then hope someone in the know will set us both straight. </span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>1.) This may be a
stretch, but I've been told a proven method to regulate the temperature of blood
resource in a blood bank, is to cycle slightly warmer and cooler
air through the storage unit, overlapping in the critical temperature
range.</span></font><font face="Arial Unicode MS"><span style='font-family:
"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoBodyText style='margin:0in;margin-bottom:.0001pt'><font size=2
face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style"'>Why
they can't simply dial in a thermostat at the temperature they want, and a get
stable temperature... I don't know, I'm not an engineer. </span></font><font
size=2 face="Arial Unicode MS"><span style='font-size:10.0pt;font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>2.) Closer to home;
over winter, I finally completed the heating/cooling system (ductwork,
furnace, etc.) at our cottage. Tom K., our mechanical plant supervisor
suggested the most efficient operation (we heat it all winter) is having the
furnace-fan run at low-speed continually, with the furnace actively cycling in
warm air in as required, rather have everything shut off until it gets
cold, then try heat it all up again. Make's sense, and it works!</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Granted Dave, neither
of us are enthalpy control experts (I sure ain’t), but I hope we
realize piano climate systems don't "force" humidity in or out, that
should be fairly obvious. You might find a conversation I had with Bill
Spurlock about water-damaged pianos helpful: </span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Bill explained that
warming and circulating air adjacent to moist wood creates a gradient, or
in simple terms makes the air a more inviting destination for the moisture,
than the wood is. This gradient invites the moisture to change directions, and
move towards the more welcoming environment.</span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Likewise, to restore
equilibrium moisture content to wood, simply provide moist air in the
vicinity... no “forcing” required. If the wood is dry it will
accept moisture, if it isn't, it won't. By the way the most satisfying
explanation I’ve ever encountered on this subject was the class Roger
Wheelock gave at the Dallas Convention. Roger of course is a scientist, and
Bill I believe, has an engineering background. Isn’t it nice the PTG has
such good resources, so we don’t have to “guess” about this
stuff?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>As for tempering the
climate around pianos, I think all we’re really trying to do Dave, is
maintain the equilibrium moisture content in the wood (soundboard), to keep the
piano </span></font><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>at pitch and prevent
damage. And it seems we can do this quite successfully, using the
products you mention, to maintain a compatible range of relative humidity in
the air.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>An “Inconvenient
Truth” as you and I both know, is if relative humidity isn’t
stable, the moisture content of the wood will not be stable
(“Nature’s Law,” not ours), and if the wood isn’t
stable, neither is the tuning, no matter the manufacturer, the day of the week,
where you live, who tuned it, or which foot they stood on. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>(I used to think piano
owners/sales persons were the biggest perpetrators of "piano-tuning
myths,” but you might be surprised at the fanciful notions some of
“us” have cultivated… myself included!? Yipes! ;>) <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Anyhow, people who
understand wood, know “the rules,” and hopefully we do too, since
pianos are made of wood. For what we don’t know, it’s
fortunate to have a wealth of knowledge and experience in the technology
and manufacturing fields we can rely on. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Mark Cramer,</span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=2
face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style"'>Brandon</span></font></st1:PlaceName><font
size=2 face="Bookman Old Style"><span style='font-size:10.0pt;font-family:
"Bookman Old Style"'> <st1:PlaceName w:st="on">University</st1:PlaceName></span></font></st1:place><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> </span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>PS Regarding things
that “do” work:</span></font><font face="Arial Unicode MS"><span
style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Last year ago I
sent a post about fitting a soundboard cover to a KG-3c, in a church that
had 30-cent seasonal pitch swings, despite having a Dampp-Chaser with one
50w and two 25w dehumidifiers. </span></font><font face="Arial Unicode MS"><span
style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>I tuned the same piano
this morning, and was pleased to find the tenor just 6 cents sharp, and the
rest of the piano right on the button! </span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Arial Unicode MS"><span style='font-size:
12.0pt;font-family:"Arial Unicode MS"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Arial Unicode MS"><span style='font-size:
12.0pt;font-family:"Arial Unicode MS"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Arial Unicode MS"><span style='font-size:
12.0pt;font-family:"Arial Unicode MS"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Arial Unicode MS"><span style='font-size:
12.0pt;font-family:"Arial Unicode MS"'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> </span></font><font
face="Arial Unicode MS"><span style='font-family:"Arial Unicode MS"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'> </span></font><font
face="Bookman Old Style"><span style='font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1
face="Bookman Old Style"><span style='font-size:9.0pt;font-family:"Bookman Old Style"'>That’s
the one thing (or one of the things) that I don’t get about these
systems. I’m fortunate that our climate here is sufficiently benign
that we don’t have any systems installed. As the system is
currently designed, it forces humidity into the piano – even when the
ambient humidity is high – and then forces it out. To me it would make
more sense to have the humidifier come on at say 35% and the dehumidifier to
come on at 50% (45%??) but in between those it would leave the poor piano
alone! Or in the summer if your humidity is high, just disconnect the
humidifier and the opposite in the winter. What good is it to continually
humidify then dehumidify the piano probably several times a day?<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3
face="Bookman Old Style"><span style='font-size:12.0pt;font-family:"Bookman Old Style"'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3
face="Bookman Old Style"><span style='font-size:12.0pt;font-family:"Bookman Old Style"'>dave<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=1 color=black
face=Helvetica><span style='font-size:9.0pt;font-family:Helvetica;color:black'><br>
</span></font><font size=2 face="Bookman Old Style"><span style='font-size:
10.0pt;font-family:"Bookman Old Style"'>David M. Porritt</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style";
color:black'><a href="mailto:dporritt@smu.edu">dporritt@smu.edu</a></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]<b><span
style='font-weight:bold'>On Behalf Of </span></b>Porritt, David<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 08, 2006
10:19 AM<br>
<b><span style='font-weight:bold'>To:</span></b> College and University
Technicians<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [CAUT] Topping up the
tank</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jeff Tanner wrote:<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> … and even in these high humidity summers the tanks need filling
more often than every two weeks -- more like a week to 10 days.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<div>
<p class=MsoNormal><font size=1 face=Helvetica><span style='font-size:9.0pt;
font-family:Helvetica'>That’s the one thing (or one of the things) that I
don’t get about these systems. I’m fortunate that our climate
here is sufficiently benign that we don’t have any systems
installed. As the system is currently designed, it forces humidity into
the piano – even when the ambient humidity is high – and then
forces it out. To me it would make more sense to have the humidifier come
on at say 35% and the dehumidifier to come on at 50% (45%??) but in between
those it would leave the poor piano alone! Or in the summer if your
humidity is high, just disconnect the humidifier and the opposite in the
winter. What good is it to continually humidify then dehumidify the piano
probably several times a day?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>dave<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=1 color=black face=Helvetica><span
style='font-size:9.0pt;font-family:Helvetica;color:black'><br>
</span></font><font size=2><span style='font-size:10.0pt'>David M. Porritt</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><a href="mailto:dporritt@smu.edu">dporritt@smu.edu</a></span></font><o:p></o:p></p>
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