The New Zealand Railways Magazine, Volume 2, Issue 11 (March 1, 1928)
(5) Losses Due to Unconsumed Fuel in Cinders and Sparks, 10%
(5) Losses Due to Unconsumed Fuel in Cinders and Sparks, 10%.
Much of this loss can be reduced by intelligent firing. (This item was dealt with under the Theory of Combustion.)