. Transactions . ARRANGEMENT TO KEEPDUST FROM JOURNALS 4,S IRON CHILI MILL FOR CRUSHING BULLION. Roasting Furnace.—The roasting furnace was a small reverberatoryused only for bullion. Its construction is shown in Fi<rs. 2 and hearth (see also Fig. 4) was composed of 2 cast-iron plates boltedtogether and bedded in sand. The furnace-walls were recessed onall sides for the plates, as indicated in the drawing. This construc-tion allowed the expansion and contraction of the hearth, and pre-vented the charge from spilling over the edges of the plates. Ironplates were used, in order that no
. Transactions . ARRANGEMENT TO KEEPDUST FROM JOURNALS 4,S IRON CHILI MILL FOR CRUSHING BULLION. Roasting Furnace.—The roasting furnace was a small reverberatoryused only for bullion. Its construction is shown in Fi<rs. 2 and hearth (see also Fig. 4) was composed of 2 cast-iron plates boltedtogether and bedded in sand. The furnace-walls were recessed onall sides for the plates, as indicated in the drawing. This construc-tion allowed the expansion and contraction of the hearth, and pre-vented the charge from spilling over the edges of the plates. Ironplates were used, in order that no bullion should be left on thehearth after a charge had been drawn, a matter of importance inmaking tests and in refining for other companies, some of which, asthe Bonanza firm, were very particular in their requirements. Thespace between the hearth and the chimney served as a dust-chamber, 740 THE PROCESS USED FOR REFINING COPPERY BULLION. -24 ft. High f 00 1^^. M*- -2-6— -1-4—
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
