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#11
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"Exposing to the right" is over exposed, what now?
On 10/18/09 14:50 , David J Taylor wrote:
"Alan Browne" wrote in message ... [] Good point. Are train engines (of that era) painted black or do they get that way with age? (soot). I think both, but you would need to ask a railway buff, which I'm not. Cheers, David Many are painted black. It was utilitarion and a cost effective way of preventing rust, and it didn't show the soot. There were some coal fired locomotives that were painted colors. Required a lot of washing, but presented no other issues. Some hold that a black locomotive, radiates away excess heat in the firebox more effectively than colors or natural metals. It's one of the half dozen reasons why radiators on cars are painted black. There is some science to support this reasoning. As coal fired locomotives passed into history, newer models, diesels and electrics, were painted company colors. Or left in natural aluminum. |
#12
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"Exposing to the right" is over exposed, what now?
D. Peter Maus wrote:
On 10/18/09 14:50 , David J Taylor wrote: "Alan Browne" wrote in message ... [] Good point. Are train engines (of that era) painted black or do they get that way with age? (soot). I think both, but you would need to ask a railway buff, which I'm not. Cheers, David Many are painted black. It was utilitarion and a cost effective way of preventing rust, and it didn't show the soot. There were some coal fired locomotives that were painted colors. Required a lot of washing, but presented no other issues. Some hold that a black locomotive, radiates away excess heat in the firebox more effectively than colors or natural metals. It's one of the half dozen reasons why radiators on cars are painted black. There is some science to support this reasoning. As coal fired locomotives passed into history, newer models, diesels and electrics, were painted company colors. Or left in natural aluminum. FWIW, there's a "steam trains" pool on flickr with going on 20,000 images. |
#13
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"Exposing to the right" is over exposed, what now?
On 10/18/09 15:20 , J. Clarke wrote:
D. Peter Maus wrote: On 10/18/09 14:50 , David J Taylor wrote: "Alan wrote in message ... [] Good point. Are train engines (of that era) painted black or do they get that way with age? (soot). I think both, but you would need to ask a railway buff, which I'm not. Cheers, David Many are painted black. It was utilitarion and a cost effective way of preventing rust, and it didn't show the soot. There were some coal fired locomotives that were painted colors. Required a lot of washing, but presented no other issues. Some hold that a black locomotive, radiates away excess heat in the firebox more effectively than colors or natural metals. It's one of the half dozen reasons why radiators on cars are painted black. There is some science to support this reasoning. As coal fired locomotives passed into history, newer models, diesels and electrics, were painted company colors. Or left in natural aluminum. FWIW, there's a "steam trains" pool on flickr with going on 20,000 images. Cool, thanks. |
#14
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"Exposing to the right" is over exposed, what now?
David J Taylor wrote:
"Alan Browne" wrote in message ... [] Good point. Are train engines (of that era) painted black or do they get that way with age? (soot). I think both, but you would need to ask a railway buff, which I'm not. Where's Tony Polson (aka "Bruce") when we need him? |
#15
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"Exposing to the right" is over exposed, what now?
D. Peter Maus wrote:
On 10/18/09 14:50 , David J Taylor wrote: "Alan Browne" wrote in message ... [] Good point. Are train engines (of that era) painted black or do they get that way with age? (soot). I think both, but you would need to ask a railway buff, which I'm not. Cheers, David Many are painted black. It was utilitarion and a cost effective way of preventing rust, and it didn't show the soot. There were some coal fired locomotives that were painted colors. Required a lot of washing, but presented no other issues. Some hold that a black locomotive, radiates away excess heat in the firebox more effectively than colors or natural metals. It's one of the half dozen reasons why radiators on cars are painted black. There is some science to support this reasoning. Yes indeed. Black paint (and it does have to be chosen correctly) is a broad spectrum "black body" that radiates away more heat as infrared energy. However I don't know when if this was known back in the 1800's and early 1900's. This is why "black boxes" on airplanes are black (Other than the orange FDR/VR) - to help get rid of heat. (OTOH boxes that radiate at each other because of proximity lose the advantage). As coal fired locomotives passed into history, newer models, diesels and electrics, were painted company colors. Or left in natural aluminum. |
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