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Index of Subjects This is a multi-part message in MIME format. --------------F72A2CDCA86614C24F821609 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit 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: >>>