Modern Gasworks Practice

VERTICAL RETORTS AND CHAMBER OVENS 187 plants the gas from the ovens themselves is used for maintaining the working heats ; but in the Birmingham installation, as before explained, the heating is carried out by means of low-grade gas from a Mond producer. The regulation of the gas to each. chamber is arranged. for by means of adjustable metal cocks, and the quantity passing forward is also dependent upon the pressure from the Mond producers. For the production of a dense metallurgical coke the coal is first ground in a special Fig. 102.—Munich Chambbr-Oven System. form of disintegrator to a fine dust, and is th.cn delivered to the stamping machine, where it is compressed into a solid cake of practically the same dimensions as the oven, and introchiced through the end door. For many purposes unstamped coal may be made use of, in which case charging takes place by means of a machine running along the top of the settings and discharging through hoppers into three openings in the roofs of the chambers. The coal is afterwards levelied by a machine