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The New Zealand Railways Magazine, Volume 2, Issue 10 (February 1, 1928)

Clinker

Clinker.

Clinker, as we have shown, forms a mass of ash mixed with iron silica, etc., and is useless for heat purposes. It spreads over the grate and chokes the fire thus reducing the grate area. Firemen should watch the accumulation of clinker and page 43 never permit it to clutter up the great area. When clinker forms it should be broken up and ejected through the drop grates. Care must be taken to get rid of it conveniently so that it does not interfere with the steaming of the boiler. Unless care is observed in this respect green coal will be lost by being ejected with the clinker. From my observations I think that this is one of our most prolific sources of waste.