[NatureNS] Stove Blacking and heat transmission

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From: Patrick Kelly <Patrick.Kelly@Dal.Ca>
To: "naturens@chebucto.ns.ca" <naturens@chebucto.ns.ca>
Thread-Topic: [NatureNS] Stove Blacking and heat transmission
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Date: Thu, 28 May 2020 18:50:05 +0000
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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 f=
lew off so it was pretty robust!

One thing that I could see that might prevent it from turning is if it star=
ted with one of the hanging pieces right against a chime. We ran into the p=
roblem 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 leavin=
g candles unattended they do not seem as popular now as they once were as m=
any 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 direc=
tly 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 yea=
rs, perhaps more, it just had not turned. I left it there with intent to so=
me 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-an=
gel-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 t=
hat 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 li=
ght, an object that looks red, does so because it absorbs all other wavelen=
gth in the visible part of the spectrum and reflects red light. An object t=
hat 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 obje=
ct will reflect all wavelengths. The finish (matte or glossy) would also ha=
ve 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 radia=
tion 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 fur=
nace and radiators , I wondered at a certain point if the radiators would r=
adiate more heat if they were painted black.  I couldn't find anything on t=
he 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 fro=
m 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:d=
webster@glinx.com>> wrote:

Hi again Henk & All,

    Original box found; says "Swedish Angel Chimes" on main panel: "Angel C=
himes 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 belie=
ved; the difference between 'black and white' (via dull grey). That Swedish=
 connection may be in error. Will be on the lookout for the original packag=
e likely about 50 years old.

Dave W.

On 5/26/2020 9:13 PM, Henk Kwindt wrote:
Hi Dave and All,

I don=92t really have anything to add to your explanation but I thought it =
interesting that you have one of those =93angel carousels=94!
We have had ours for at least 40+ years, they were quite popular in The Net=
herlands in the 60s, didn=92t know they came from Sweden.
Ours is packed with other Christmas decorations so it is being placed on th=
e stove every year in Dec.
We have not used the candles to =93power=94 it for a long time.
Since we have a more modern high efficiency stove the black top is not dire=
ctly accessible so I won=92t 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:dweb=
ster@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 a=
ngel hangs and a brass rod hanging from each angel rings a chime as it turn=
s.

I just stuck the working parts in a support made from a length of burned ou=
t oven element, bent to be stable with the filling removed from the vertica=
l end by tapping.

Just to confuse matters; note that what we call clockwise (down on the righ=
t side) is counterclockwise from the clock's viewpoint.

YT, Dave W.


On 5/26/2020 5:53 PM, Stephen Shaw wrote:
Hi Dave,
I=92m not familiar with your named device or its principle of operation, bu=
t we too have a small windmill that simply rests on top of our (also black)=
 wood stove and spins faster as the stove