During {HEAD ~ operation} of the device of FIG 1, a charge of coal 11 to be coked is introduced through filling opening 9 into coking chamber 3, which in {TAIL ~ this embodiment} is designed as a cavity or chamber resonator 
During { HEAD ~ operation } of the device of FIG 1 , a charge of coal 11 to be coked is introduced through filling opening 9 into coking chamber 3 , which in { TAIL ~ this embodiment } is designed as a cavity or chamber resonator
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH