750 GEOLOGY AND MINING INDUSTRY OF LEADVILLE. 



Platk XXXIII. — Furnace auil dust-chamber. Smelters F aud M. 



Fig. 1. Elevation of rectangular furnace at Smelter F, showing patent tuyeres. 

 Fig. 2. Iron dust-chamber at Smelter M. 

 XXXIV.— Irou dust-chamber. Smelter F. 



Fig. 1. Side elevation of dust-chamber. 

 Fig. 2. Elevatiou, showing connection with furnace. 

 XXXV. — Square furnaces. Smelter G. 



Fig. 1. Smaller furnace, side elevation. 

 Fig. 2. Larger furnace, front elevation. 

 XXXVI.— Smelter G. 



Fig. 1. General elevation of furnaces, showing dust-chambers, flues, and stack. 

 Fig. 2. Section of furnace at Smelter C, showing zones of temperatnre. 

 XXXVII. — Circular furnace. Smelter H. 

 Fig. 1. Perspective view. 



Fig. 2. Vertical section through furnace and dust-chamber. 

 XXXVIII.— Fig. 1. Dust-chamber at Smelter H. 



Fig. 2. Jolly's specific gravity spring-balance. 

 XXXIX. — Assay furnace at Smelter H, in isometric projection. 

 XL. — Dust-chamber at Smelter J. 



Fig. 1. Side elevation showing round furnace. 

 Fig. 2. Plau of furnaces and dust chamber. 

 XLI. — Blake crushers. 



Fig. 1. Horizontal i)rojection 

 Fig. 2. Vertical section 



> of Eccentric crusher. 



Fig. 3. Perspective view i 



„• , TT .■ 1 i- > of Challenge crusher. 



Fig. 4. Vertical section i ° 



XLII. — Blowers. 



Fig. 1. Perspective view ) 



Fig. 2. Transverse vertical section ^ Bl^ke s rotary blower. 



Fig. 3. Perspective view i 



.^. , rr »• I i- > Boots positive-blast blower. 



lig. 4. Transverse vertical section J ^ 



XLIII. — Assay implements. 



Figs. 1 and 2. Slag mold. 



Figs. 3 aud 5. Crucibles. 



Fig. 4. Scorifier. 



Fig. 6. Cupel. 



Fig. 7. Guyard's specific-gravity apparatus. 



Fig. 8. Sieve for pulverized ore. 



Figs. 9 and 10. Bucking-plate. 



Fig. 11. Bucker. 



Fig. 12. Irou pestle and mortar. 

 XLIV. — Smelter's implements. 



Figs. 1, 2, .and 3. Fuel shovels. 



Figs. 4 aud 5. Ore shovels. 



Fig. 6. Tapping-rod. 



Fig. 7. Bar used for detachiug accretions. 



Fig. 8. Curved bar for cleaning siphon-tap. 



Figs. 9 and 10. Brick-mold. 



Fig. 11. Wire used in cutting clay in molds. 



Fig. 12. Chisel or punch for taking assay bits from bullion. 



Fig. 13. Form of assay bit taken. 



Fig. 14. Another form of chisel. 



Fig. V). Assay bit taken by latter. 

 XLV. — Fig .1. Alden ore-crusher, in perspective. 



Fig. 2. Disposition of furnace, dust-chamber, .and blower. Smelter I. 



Figs. 3 to 7. Forms of bullion molds. 



