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Hi Patrick & All,
The weather forecast indicated a need for fire this afternoon so I
prepared a test of the 'Blacking Effect' by having the right hand half
of the stove top freshly blackened and the left side with the previous
blacking untouched and now slightly dull. With a brisk fire today,
rotation was nil to intermittent on both sides of the stove.
So I now think that the previous brisk rotation on a freshly
blackened stove was a fluke. My improvised stand has some slack between
the base socket and the main shaft of the angel chimes, shimmed long ago
with thin wedges of folded Al foil, and it can naturally function
effectively only if the main shaft is vertical. I suspect that, by
chance, those shims were shifted during cleaning in a way that made the
shaft essentially vertical for that brief period. Rotation today was
often started by tipping the unit with pliers.
Sometime this summer I will attempt to shim that slack joint
securely so the main shaft is precisely vertical.
YT, DW, Kentville
On 5/28/2020 3:50 PM, Patrick Kelly wrote:
> We had a set of those growing up as well, but they came in a different
> box. Mechanically, they were pretty simple, a cone resting on a point
> so there would be little friction. My brother and I used to flick the
> piece that the angels hung from to see how fast we could get it going
> before the angels flew off so it was pretty robust!
>
> One thing that I could see that might prevent it from turning is if it
> started with one of the hanging pieces right against a chime. We ran
> into the problem a few times when using candles. It seemed as though
> it needed a bit of initial freedom to move before it hit a chime...
> after that it was fine as long as the candles stayed lit. Given the
> wariness people have of leaving candles unattended they do not seem as
> popular now as they once were as many of my uncles and aunts had them too!
>
> Pat
>
>
> On May 28, 2020, at 3:07 PM, David Webster wrote:
>
>> CAUTION: The Sender of this email is not from within Dalhousie.
>>
>> Hi Pat,
>>
>> I think you were replying mostly to Nancy but you reply conflicts
>> directly with my recent experience. That stove blacking made a huge
>> difference.
>>
>> Whether the Angel Chimes stopped turning reliably 12 years ago,
>> earlier or later I can not be sure; not a high priority. But in the
>> previous 4 years, perhaps more, it just had not turned. I left it
>> there with intent to some day take it apart to see if the unknown
>> fault was reversible.
>>
>> As it turned out wear of the unit, or other damage, was not the
>> problem. And the blacking was applied so the stove would not look so
>> neglected.
>>
>> With just a light fire it turned like new. So the 'cure' was due
>> either greater radiant heat from the stove upper surface or black
>> magic. I prefer greater radiant heat.
>>
>> The Angel Chimes are not black; image below.
>>
>> https://mygrowingtraditions.com/blogs/news/15734508-the-original-swedish-angel-chimes
>>
>> YT, DW
>>
>>
>> On 5/28/2020 12:36 PM, Patrick Kelly wrote:
>>> When it comes to blackbody radiation (and most things are pretty
>>> close to that if they are solid, liquid, or a dense gas) the amount
>>> of radiation that they *emit* at various wavelengths depends only on
>>> their temperature.
>>>
>>> https://en.wikipedia.org/wiki/Black-body_radiation
>>>
>>> When it comes to *absorbing* radiation, the colour does matter. In
>>> visible light, an object that looks red, does so because it absorbs
>>> all other wavelength in the visible part of the spectrum and
>>> reflects red light. An object that is black (in the visible part of
>>> the spectrum) will act a lot more like a blackbody (absorbing all
>>> wavelegths of visible light) while a white object will reflect all
>>> wavelengths. The finish (matte or glossy) would also have some
>>> effect. I expect that a black fan-like device on stove will be more
>>> strongly powered because the black allows it to absorb more infrared
>>> radiation from the surrounding stove than a gray one, thus getting
>>> hotter.
>>>
>>> Pat
>>>
>>>
>>> On May 27, 2020, at 11:11 PM, N Robinson wrote:
>>>
>>>> CAUTION: The Sender of this email is not from within Dalhousie.
>>>>
>>>>
>>>> Re the blacking, when living in Montreal in an old house with hot
>>>> water furnace and radiators , I wondered at a certain point if the
>>>> radiators would radiate more heat if they were painted black. I
>>>> couldn't find anything on the net, probably because I did not know
>>>> what question to ask. It was just a hunch, because black absorbs
>>>> more heat; but this heat would be coming from the inside, so to
>>>> speak...?
>>>>
>>>> Still don't know but perhaps David's discovery holds the answer.
>>>>
>>>> I did not paint them black and did not use my chimes to test anything.
>>>>
>>>> Nancy
>>>>
>>>> On Wed, May 27, 2020 at 10:44 PM David Webster <dwebster@glinx.com
>>>> <mailto:dwebster@glinx.com>> wrote:
>>>>
>>>> Hi again Henk & All,
>>>>
>>>> Original box found; says "Swedish Angel Chimes" on main
>>>> panel: "Angel Chimes A Product of Swedish Handicraft" on end tab.
>>>> YT, DW, Kentville
>>>>
>>>> -------- Forwarded Message --------
>>>> Subject: Re: [NatureNS] Stove Blacking and heat transmission
>>>> Date: Wed, 27 May 2020 08:44:56 -0300
>>>> From: David Webster <dwebster@glinx.com>
>>>> <mailto:dwebster@glinx.com>
>>>> To: naturens@chebucto.ns.ca <mailto:naturens@chebucto.ns.ca>
>>>>
>>>>
>>>>
>>>> Hi Henk & All, It is one of these effects which must be seen
>>>> to be believed; the difference between 'black and white' (via
>>>> dull grey). That Swedish connection may be in error. Will be on
>>>> the lookout for the original package likely about 50 years old.
>>>>
>>>> Dave W.
>>>>
>>>> On 5/26/2020 9:13 PM, Henk Kwindt wrote:
>>>>> Hi Dave and All,
>>>>>
>>>>> I don’t really have anything to add to your explanation but I
>>>>> thought it interesting that you have one of those “angel
>>>>> carousels”!
>>>>> We have had ours for at least 40+ years, they were quite
>>>>> popular in The Netherlands in the 60s, didn’t know they came
>>>>> from Sweden.
>>>>> Ours is packed with other Christmas decorations so it is being
>>>>> placed on the stove every year in Dec.
>>>>> We have not used the candles to “power” it for a long time.
>>>>> Since we have a more modern high efficiency stove the black
>>>>> top is not directly accessible so I won’t be able to repeat
>>>>> your experiment.
>>>>> Henk Kwindt, Cow Bay, NS.
>>>>>
>>>>>
>>>>>
>>>>>> On May 26, 2020, at 7:47 PM, David Webster
>>>>>> <dwebster@glinx.com> <mailto:dwebster@glinx.com> wrote:
>>>>>>
>>>>>> Hi Steve & All,
>>>>>>
>>>>>> No my mill is powered entirely by upward flow of warm air; a
>>>>>> thin circular sheet of brass clipped to form eight vanes
>>>>>> which slope downward to the left. This fan consequently turns
>>>>>> near side to the left. (Clockwise viewed from above).
>>>>>>
>>>>>> The original unit, made in Sweden, was powered by candles and
>>>>>> intended as a Christmas table decoration.
>>>>>>
>>>>>> The fan is supported by a brass plate with three arms on each
>>>>>> of which an angel hangs and a brass rod hanging from each
>>>>>> angel rings a chime as it turns.
>>>>>>
>>>>>> I just stuck the working parts in a support made from a
>>>>>> length of burned out oven element, bent to be stable with the
>>>>>> filling removed from the vertical end by tapping.
>>>>>>
>>>>>> Just to confuse matters; note that what we call clockwise
>>>>>> (down on the right side) is counterclockwise from the clock's
>>>>>> viewpoint.
>>>>>>
>>>>>> YT, Dave W.
>>>>>>
>>>>>>
>>>>>> On 5/26/2020 5:53 PM, Stephen Shaw wrote:
>>>>>>> Hi Dave,
>>>>>>> I’m not familiar with your named device or its principle of
>>>>>>> operation, but we too have a small windmill that simply
>>>>>>> rests on top of our (also black) wood stove and spins faster
>>>>>>> as the stove heats up. It works as a Peltier device, with
>>>>>>> parallel hot and cold junctions built into a short aluminium
>>>>>>> tower, the top of which is an air-cooled heat sink. I think
>>>>>>> it cost ~$130 some years ago. The ‘hot' side of the Peltier
>>>>>>> junction faces down to the hot stove top upon which the
>>>>>>> frame rests, while the ‘cold' side is uppermost, and its
>>>>>>> heat sink is cooled partly by the little rotating fan and
>>>>>>> partly by radiation. With enough heating differential, the
>>>>>>> Peltier effect generates a small current which is enough to
>>>>>>> turn a small DC motor that carries the fan.
>>>>>>> Is this like your device? If so, you may have simply have
>>>>>>> cleaned and in effect flattened the stove top a bit so the
>>>>>>> base of the device makes better thermal contact with the Al
>>>>>>> base of the windmill, though the black-body improvement
>>>>>>> should help a bit. A better solution in my case and maybe
>>>>>>> yours would be to apply a thin layer of heat-sink compound
>>>>>>> to the base of the tower. This is a messy paste based on
>>>>>>> zinc oxide, used standard in electronics to attach a power
>>>>>>> transistor to an aluminium or copper heat sink, while at the
>>>>>>> same time providing electrical insulation. It would
>>>>>>> certainly enhance heat conduction to our windmill, but the
>>>>>>> compound is white, sticky and difficult to remove once
>>>>>>> applied: I would become locally unpopular if I so disfigured
>>>>>>> our black stove top, so I haven’t yet risked the experiment.
>>>>>>> Steve
>>>>>>>
>>>>>>> On May 25, 2020, at 7:55 PM, David Webster
>>>>>>> <dwebster@glinx.com> <mailto:dwebster@glinx.com> wrote:
>>>>>>>> Dear All,
>>>>>>>>
>>>>>>>> I heat the house mostly with wood burned in a fireplace
>>>>>>>> insert and,
>>>>>>>> apart from some air circulation in under the fire box, up
>>>>>>>> behind it and
>>>>>>>> out over the top, most heating is radiant off of the top.
>>>>>>>>
>>>>>>>> For decades I have used a Swedish Christmas heat mill, sold for
>>>>>>>> candles, which I adapted for stove top use, as a measure of
>>>>>>>> heat release
>>>>>>>> rate. In recent decades it turned less frequently and for
>>>>>>>> several years
>>>>>>>> not turned at all even with a brisk fire so I suspected
>>>>>>>> wear and
>>>>>>>> increased friction at pivot points.
>>>>>>>>
>>>>>>>> The stove top had become dull grey in color so to improve
>>>>>>>> appearance I located a source of blacking last fall but it
>>>>>>>> could be
>>>>>>>> applied only to a cold stove so was applied to the top, on
>>>>>>>> first recent
>>>>>>>> warm morning this spring, and the increase in heat
>>>>>>>> radiation from the
>>>>>>>> top was dramatic. With just a token fire that Swedish heat
>>>>>>>> mill was
>>>>>>>> spinning full tilt !
>>>>>>>>
>>>>>>>> This I assume was a practical demonstration of increased
>>>>>>>> radiation
>>>>>>>> from a black surface (Black Body Radiation ?). And all
>>>>>>>> along I had
>>>>>>>> imagined that stove blacking was just for appearance.
>>>>>>>>
>>>>>>>> Yt, DW, Kentville
>>>>>>>>
>>>>>>>>
>>>>
>>>>
>>>> --
>>>> Nancy Robinson
>>>> 514-605-7186
>>>>
>>>>
>>>
>>>
>>> Patrick Kelly
>>> 159 Town Road
>>> Falmouth NSB0P 1L0
>>> Canada
>>>
>>> (902) 472-2322
>>>
>
>
> Patrick Kelly
>
> 159 Town Road
>
> Falmouth NSB0P 1L0
>
> Canada
>
>
> (902) 472-2322
>
>
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<p>Hi Patrick & All,</p>
<p> The weather forecast indicated a need for fire this afternoon
so I prepared a test of the 'Blacking Effect' by having the right
hand half of the stove top freshly blackened and the left side
with the previous blacking untouched and now slightly dull. With a
brisk fire today, rotation was nil to intermittent on both sides
of the stove. <br>
</p>
<p> So I now think that the previous brisk rotation on a freshly
blackened stove was a fluke. My improvised stand has some slack
between the base socket and the main shaft of the angel chimes,
shimmed long ago with thin wedges of folded Al foil, and it can
naturally function effectively only if the main shaft is vertical.
I suspect that, by chance, those shims were shifted during
cleaning in a way that made the shaft essentially vertical for
that brief period. Rotation today was often started by tipping the
unit with pliers.<br>
</p>
<p> Sometime this summer I will attempt to shim that slack joint
securely so the main shaft is precisely vertical. </p>
<p> YT, DW, Kentville<br>
</p>
<div class="moz-cite-prefix">On 5/28/2020 3:50 PM, Patrick Kelly
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:48E56AE2-5A3B-4E9C-97C0-0853DA3DFEA9@dal.ca">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
We had a set of those growing up as well, but they came in a
different box. Mechanically, they were pretty simple, a cone
resting on a point so there would be little friction. My brother
and I used to flick the piece that the angels hung from to see how
fast we could get it going before the angels flew off so it was
pretty robust!
<div><br>
</div>
<div>One thing that I could see that might prevent it from turning
is if it started with one of the hanging pieces right against a
chime. We ran into the problem a few times when using candles.
It seemed as though it needed a bit of initial freedom to move
before it hit a chime... after that it was fine as long as the
candles stayed lit. Given the wariness people have of leaving
candles unattended they do not seem as popular now as they once
were as many of my uncles and aunts had them too!</div>
<div><br>
</div>
<div>Pat</div>
<div><br>
</div>
<div> <br>
<div>
<div>On May 28, 2020, at 3:07 PM, David Webster wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div><!-- START CAUTION Box Code -->
<table style="padding:10px 0 10px 0" width="100%"
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<div
style="font-family:Arial,sans-serif;font-size:12px;line-height:16px;text-align:left;color:#ffffff;"><span
style="font-weight:bold;font-size:12px;">CAUTION:</span> The Sender of
this email is not from within
Dalhousie.</div>
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</td>
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</tbody>
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</td>
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</tbody>
</table>
<!-- END CAUTION Box Code -->
<div>
<p>Hi Pat,</p>
<p> I think you were replying mostly to Nancy but you
reply conflicts directly with my recent experience.
That stove blacking made a huge difference.
<br>
</p>
<p> Whether the Angel Chimes stopped turning reliably
12 years ago, earlier or later I can not be sure; not
a high priority. But in the previous 4 years, perhaps
more, it just had not turned. I left it there with
intent to some day take it apart to see if the unknown
fault was reversible. <br>
</p>
<p> As it turned out wear of the unit, or other
damage, was not the problem. And the blacking was
applied so the stove would not look so neglected.<br>
</p>
<p> With just a light fire it turned like new. So the
'cure' was due either greater radiant heat from the
stove upper surface or black magic. I prefer greater
radiant heat.</p>
<p> The Angel Chimes are not black; image below. <br>
</p>
<p><a
href="https://mygrowingtraditions.com/blogs/news/15734508-the-original-swedish-angel-chimes"
moz-do-not-send="true">https://mygrowingtraditions.com/blogs/news/15734508-the-original-swedish-angel-chimes</a></p>
<p>YT, DW<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 5/28/2020 12:36 PM,
Patrick Kelly wrote:<br>
</div>
<blockquote type="cite"
cite="mid:EDE3990F-6359-409A-B7DD-4E4AFFE9C321@dal.ca">When
it comes to blackbody radiation (and most things are
pretty close to that if they are solid, liquid, or a
dense gas) the amount of radiation that they
<b>emit</b> at various wavelengths depends only on
their temperature.
<div><br>
</div>
<div><a
href="https://en.wikipedia.org/wiki/Black-body_radiation"
moz-do-not-send="true">https://en.wikipedia.org/wiki/Black-body_radiation</a></div>
<div><br>
</div>
<div>When it comes to <b>absorbing</b> radiation, the
colour does matter. In visible light, an object that
looks red, does so because it absorbs all other
wavelength in the visible part of the spectrum and
reflects red light. An object that is black (in the
visible part of the spectrum) will act a lot more
like a blackbody (absorbing all wavelegths of
visible light) while a white object will reflect all
wavelengths. The finish (matte or glossy) would also
have some effect. I expect that a black fan-like
device on stove will be more strongly powered
because the black allows it to absorb more infrared
radiation from the surrounding stove than a gray
one, thus getting hotter. </div>
<div><br>
</div>
<div>Pat</div>
<div><br>
</div>
<div> </div>
<div><br>
<div>
<div>
<div>On May 27, 2020, at 11:11 PM, N Robinson
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div><!-- START CAUTION Box Code -->
<table style="padding:10px 0 10px 0"
width="100%" cellspacing="0"
cellpadding="0" border="0" align="center">
<tbody>
<tr>
<td
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<table
style="background:#707372;background-color:#707372;width:100%;border-radius:5px;overflow:hidden;"
cellspacing="0" cellpadding="0"
border="0" align="center">
<tbody>
<tr>
<td style="border-top:solid
8px #fbe122;padding:4px
8px;text-align:left;vertical-align:top;">
<table role="presentation"
cellspacing="0"
cellpadding="0" border="0">
<tbody>
<tr>
<td align="left">
<div
style="font-family:Arial,sans-serif;font-size:12px;line-height:16px;text-align:left;color:#ffffff;"><span
style="font-weight:bold;font-size:12px;">CAUTION:</span> The Sender of
this email is not
from within
Dalhousie.</div>
</td>
</tr>
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</table>
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</tbody>
</table>
<!-- END CAUTION Box Code -->
<div>
<div dir="ltr">
<div dir="ltr">
<div><br>
</div>
<div>Re the blacking, when living in
Montreal in an old house with hot
water furnace and radiators , I
wondered at a certain point if the
radiators would radiate more heat if
they were painted black. I couldn't
find anything on the net, probably
because I did not know what question
to ask. It was just a hunch,
because black absorbs more heat; but
this heat would be coming from the
inside, so to speak...?
<br>
</div>
<div><br>
</div>
<div>Still don't know but perhaps
David's discovery holds the answer.</div>
<div><br>
</div>
<div>I did not paint them black and
did not use my chimes to test
anything. <br>
</div>
<div><br>
</div>
<div>Nancy<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On
Wed, May 27, 2020 at 10:44 PM David
Webster <<a
href="mailto:dwebster@glinx.com"
target="_blank"
moz-do-not-send="true">dwebster@glinx.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p>Hi again Henk & All,<br>
</p>
<div> Original box found; says
"Swedish Angel Chimes" on main
panel: "Angel Chimes A Product
of Swedish Handicraft" on end
tab.
<br>
</div>
<div>YT, DW, Kentville<br>
</div>
<div><br>
-------- Forwarded Message
--------
<table cellspacing="0"
cellpadding="0" border="0">
<tbody>
<tr>
<th valign="BASELINE"
nowrap="nowrap"
align="RIGHT">Subject: </th>
<td>Re: [NatureNS] Stove
Blacking and heat
transmission</td>
</tr>
<tr>
<th valign="BASELINE"
nowrap="nowrap"
align="RIGHT">Date: </th>
<td>Wed, 27 May 2020
08:44:56 -0300</td>
</tr>
<tr>
<th valign="BASELINE"
nowrap="nowrap"
align="RIGHT">From: </th>
<td>David Webster <a
href="mailto:dwebster@glinx.com"
target="_blank"
moz-do-not-send="true">
<dwebster@glinx.com></a></td>
</tr>
<tr>
<th valign="BASELINE"
nowrap="nowrap"
align="RIGHT">To: </th>
<td><a
href="mailto:naturens@chebucto.ns.ca"
target="_blank"
moz-do-not-send="true">naturens@chebucto.ns.ca</a></td>
</tr>
</tbody>
</table>
<br>
<br>
Hi Henk & All, It is one
of these effects which must be
seen to be believed; the
difference between 'black and
white' (via dull grey). That
Swedish connection may be in
error. Will be on the lookout
for the original package likely
about 50 years old.<br>
<br>
Dave W.<br>
<br>
On 5/26/2020 9:13 PM, Henk
Kwindt wrote:<br>
<blockquote type="cite">Hi Dave
and All,<br>
<br>
I don’t really have anything
to add to your explanation but
I thought it interesting that
you have one of those “angel
carousels”!<br>
We have had ours for at least
40+ years, they were quite
popular in The Netherlands in
the 60s, didn’t know they came
from Sweden.<br>
Ours is packed with other
Christmas decorations so it is
being placed on the stove
every year in Dec.<br>
We have not used the candles
to “power” it for a long time.<br>
Since we have a more modern
high efficiency stove the
black top is not directly
accessible so I won’t be able
to repeat your experiment.<br>
Henk Kwindt, Cow Bay, NS.<br>
<br>
<br>
<br>
<blockquote type="cite">On May
26, 2020, at 7:47 PM, David
Webster <a
href="mailto:dwebster@glinx.com"
target="_blank"
moz-do-not-send="true">
<dwebster@glinx.com></a>
wrote:<br>
<br>
Hi Steve & All,<br>
<br>
No my mill is powered
entirely by upward flow of
warm air; a thin circular
sheet of brass clipped to
form eight vanes which slope
downward to the left. This
fan consequently turns near
side to the left. (Clockwise
viewed from above).<br>
<br>
The original unit, made in
Sweden, was powered by
candles and intended as a
Christmas table decoration.<br>
<br>
The fan is supported by a
brass plate with three arms
on each of which an angel
hangs and a brass rod
hanging from each angel
rings a chime as it turns.<br>
<br>
I just stuck the working
parts in a support made from
a length of burned out oven
element, bent to be stable
with the filling removed
from the vertical end by
tapping.<br>
<br>
Just to confuse matters;
note that what we call
clockwise (down on the right
side) is counterclockwise
from the clock's viewpoint.<br>
<br>
YT, Dave W.<br>
<br>
<br>
On 5/26/2020 5:53 PM,
Stephen Shaw wrote:<br>
<blockquote type="cite">Hi
Dave,<br>
I’m not familiar with your
named device or its
principle of operation,
but we too have a small
windmill that simply rests
on top of our (also black)
wood stove and spins
faster as the stove heats
up. It works as a Peltier
device, with parallel hot
and cold junctions built
into a short aluminium
tower, the top of which is
an air-cooled heat sink. I
think it cost ~$130 some
years ago. The ‘hot' side
of the Peltier junction
faces down to the hot
stove top upon which the
frame rests, while the
‘cold' side is uppermost,
and its heat sink is
cooled partly by the
little rotating fan and
partly by radiation. With
enough heating
differential, the Peltier
effect generates a small
current which is enough to
turn a small DC motor that
carries the fan.<br>
Is this like your device?
If so, you may have simply
have cleaned and in effect
flattened the stove top a
bit so the base of the
device makes better
thermal contact with the
Al base of the windmill,
though the black-body
improvement should help a
bit. A better solution in
my case and maybe yours
would be to apply a thin
layer of heat-sink
compound to the base of
the tower. This is a messy
paste based on zinc oxide,
used standard in
electronics to attach a
power transistor to an
aluminium or copper heat
sink, while at the same
time providing electrical
insulation. It would
certainly enhance heat
conduction to our
windmill, but the compound
is white, sticky and
difficult to remove once
applied: I would become
locally unpopular if I so
disfigured our black stove
top, so I haven’t yet
risked the experiment.<br>
Steve<br>
<br>
On May 25, 2020, at 7:55
PM, David Webster <a
href="mailto:dwebster@glinx.com"
target="_blank"
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<dwebster@glinx.com></a> wrote:<br>
<blockquote type="cite">Dear
All,<br>
<br>
I heat the house mostly
with wood burned in a
fireplace insert and,<br>
apart from some air
circulation in under the
fire box, up behind it
and<br>
out over the top, most
heating is radiant off
of the top.<br>
<br>
For decades I have used
a Swedish Christmas heat
mill, sold for<br>
candles, which I adapted
for stove top use, as a
measure of heat release<br>
rate. In recent decades
it turned less
frequently and for
several years<br>
not turned at all even
with a brisk fire so I
suspected wear and<br>
increased friction at
pivot points.<br>
<br>
The stove top had become
dull grey in color so to
improve<br>
appearance I located a
source of blacking last
fall but it could be<br>
applied only to a cold
stove so was applied to
the top, on first recent<br>
warm morning this
spring, and the increase
in heat radiation from
the<br>
top was dramatic. With
just a token fire that
Swedish heat mill was<br>
spinning full tilt !<br>
<br>
This I assume was a
practical demonstration
of increased radiation<br>
from a black surface
(Black Body Radiation
?). And all along I had<br>
imagined that stove
blacking was just for
appearance.<br>
<br>
Yt, DW, Kentville<br>
<br>
<br>
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<div>Nancy
Robinson<br>
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514-605-7186<br>
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