GEOLOGICAL SURVEY Ob INDIA. 



Memoirs, Vol. XLV1I, PI. I 



FIG. 1. KILNS FOR CALCINING COPPER ORES, PO-P'ING-CH'ANG 



Photographs by /. Coggin Bro'tun. G. S. I. Calcti'ta. 



FIG. 2. HIGH BLAST FURNACES FOR SMELTING COPPER ORES, PO-P'ING-CH'ANG 



Front view of a bench of four. 



