7 JO GEOLOGY AND MINING INDUSTRY OF LEADV1LLE. 



PLATE XXXIII. Furnace and dust-chamber. Smelters F and M. 



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

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

 XXXIV. Iron dust-chamber. Smelter F. 



Fig. 1. Side elevation of dust-chamber. 

 Fig. 2. Elevation, showing connection with furnace. 

 XXXV. Square furnaces. Smelter G. 



Fig. 1. Smaller furnace, side elevation. 

 Fig. 2. Larger furnace, front elevation. 

 XXXVI. Smelter 6. 



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

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

 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-chambor at Smelter J. 



Fig. 1. Side elevatiou showing round furnace. 

 Fig. 2. Plan of furnaces and dnst chamber. 

 XLI. Blake crushers. 



Fig. 1. Horizontal projection > 

 Fig. 2. Vertical section \ ot E c c ntric crusher. 



Fig. 3. Perspective View i 



Fig. 4. Vertical section I of Challenge crusher. 

 XL1L Blowers. 



Fig. 1. Perspective view i 



Fig. 2. Transverse vertical section \ BIake ' 8 rotar y Mower. 

 Fig. 3. Perspective view > 



Fig. 4. Transverse vertical section $ Root ' 8 P<tive.bla8t blower. 

 XLIII. Assay implements. 



Figs. 1 and 2. Slag mold. 

 Figs. 3 and 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. Iron pestle and mortar. 

 XLIV. Smelter's implements. 



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

 Figs. 4 and 5. Ore shovels. 

 Fig. 6. Tapping-rod. 



Fig. 7. Bar used for detaching 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. 15. Assay bit taken by latter. 

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



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

 Figs. 3 to 7. Forms of bullion molds. 



