METHOD OF AND APPARATUS FOR CONTINUOUS FEEDING OF DUST,COKE-LIME MIX THROUGH ELECTRODE TO REACTION ZONE IN ELECTRICAL RESISTANCE-ARC FURNACES,ESPECIALLY FOR CARBIDE MANUFACTUREJJ KOKSO-IZVESTKOVOJJ SMESI CHEREZ EHLEKTROD V ZONU REAKCII DUGOVYKH PECHEJJ SOPROTIVLENIJA,V CHASTNOSTI,DLJA PROIZVODSTVA KARBIDA