I mentioned that I had a diagram showing the heat loss between the fire and the outside of a boiler. I have now found it, and scanned it. If anyone is interested, I will send it to them. alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx www.alanstepney.info Model Engineering, Steam Engine, and Railway technical pages. ----- Original Message ----- From: <peter.chadwick@xxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Wednesday, October 13, 2004 3:51 PM Subject: [modeleng] Question - maybe off topic- certainly academic If you look at the Nagaoka curves for the quantity of heat transferred through a material such as a metal sheet or shape (eg firebox) SNIPPED. Peter Chadwick Stockholm MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.