. The railroad and engineering journal . itted, as has beenstated, is in proportion to the difference in temperature of thegases inside the tubes and tWat of the water outside. Afterpassing over the part of the tube with which the gases are firstin contact, they then arrive at another portion of the tube sur-face with a diminished temperature, and the rate of conductionis therefore diminished ; so that each successive equal portionof the heating surface transmits a less and less quantity of heat,until the hot air at last leaves the heating surface and escapesup the chimney with a certain remai
. The railroad and engineering journal . itted, as has beenstated, is in proportion to the difference in temperature of thegases inside the tubes and tWat of the water outside. Afterpassing over the part of the tube with which the gases are firstin contact, they then arrive at another portion of the tube sur-face with a diminished temperature, and the rate of conductionis therefore diminished ; so that each successive equal portionof the heating surface transmits a less and less quantity of heat,until the hot air at last leaves the heating surface and escapesup the chimney with a certain remaining excess of temperaturg * The experiments which have been made to determine these amounts donot agree exactly, but those given are thought to be the most trustworthy. t It should be remarked here that some, and perhaps many, of the cinderswhich are carried out of the chimney are not combustible, but are composedof the same materials that form clinkers on the grate. 36 THE RAILROAD AND [January, 1889. (Tr nil II11 n nil ii iiii iiiiii.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
