188 MODERN GASWORKS PRACTICE
travelling alongside the setting, the latter machine being also provided with a ram for the purpose of discharging the coke at the end of the carbonization period. The operation of discharging usually takes about five minutes. The self-sealing oven, doors are cooled by a water circulating arrangement round the frame of the door.
Munich Chambers
A system of carbonization in bulk which in a modified form lias found its way into this country is the chamber-oven plant designed by Herr Ries, of the Munich
Fig. 103.—Bench of Munich Chamber Ovbns showing Coke-qubnching Machine.
Gasworks. The chamber consists of a tapered inclined coke oven. There are three or more of these in each setting, set at angles varying from 40°-42° with. the horizontal. They are constructed from special keyed bricks and charged from an opening 011 the top of the beds. Coal is elevated to continuous overhead hoppers and directed into the ovens by means of a special shoot. Some idea of the rapidity of charging can be gained from the faet that in the most recent installations only twenty-five seconds is required for the complete filling of a chamber taking from seven and a half to eiglit