Fig. 102.—Kiderlen producer.
The space above mentioned is provided with a cleaning-door through which cinder and slag may be removed.
In other apparatus the grate rests either on the support of the refractory lining, as in the old type invented
by Wiedenfeld (Fig. 95), or upon a projection embedded in the lining, as, for instance, in the Kiderlen (Fig. 102) and Pintsch generators (Fig. 96).
In the Riché apparatus (Fig. 103) there is, besides the ordinary grate, a grate with tiers on which the fuel spreads. This grate consists of wide, hollow bars containing water. It should be noted that the apparatus is of the blower type.
Fig. 103.—Riché combustion-producer.
An interesting arrangement is found in Bénier's generator (Fig. 104). This consists of a grate formed of projections cast around a cylinder which can be turned about its axis. The finely divided ashes which are retained