Excerpt from Reports of Proceedings During 1891 of the Eastern Counties Gas Managers' Association, Manchester District Institution of Gas Engineers, Midland Association of Gas Managers, North British Association of Gas Managers, North of England Gas Managers' Associat

There is another saving, the value of which is not quite so easily estimated as the first I have mentioned, and that is the greater regularity of heat in the setting. The long time which elapses between the cleanings of the furnace, and the use of false bars to keep up the coke during the operation, maintain a uniform temperature within the setting. Open furnaces - at least, many forms of them - necessitated their being emptied four times during the day for the purpose of clinkering. This resulted in a loss of temperature within the setting, which told its tale on the production of gas per mouthpiece. Taking ad vantage of this experience, I have introduced the use of false bars into all my open furnaces at present in use. The clinkers are now removed from the furnaces while they are full of incan descent coke; and the result is a maintenance of temperature within the setting which was not experienced before. To make this system clear, I Should say that a setting of six retorts is a convenient one for the purpose, as it allows the formation of a deep and narrow furnace, which, when full of coke, exerts its full influence on the retorts which surround it. The furnace has two doors - one at the bottom for cleaning, the other at the top for feeding - and an aperture between the two, closed with a sight-plug when not in use, for the introduction of the false bars. The depth of this furnace, when fully charged, produces occasionally carbonic Oxide, in order to burn which I introduce a small drain-pipe, for the admission of air from the front of the bed. This pipe reaches to the first cross wall in the setting, and is sufficient to heat the incoming air for the combustion of the carbonic oxide formed.

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