INDEX OF LETTERS USED ON PLATES. 



A, crucible. 



A', interior of crucible. 

 A", dam of crucible. 

 a, sheathing of crucible. 

 a', sheathing of lead-pot. 



B, water-jackets. 

 B', slag-pot. 



6. fire-brick above water-jacket. 



C, masonry of shaft of furnace. 

 C', walls of shaft of furnace. 

 I), chimney. 



D' ' , dust- chamber. 



d, sheathing on top of crucible. 



E, stack. 



F, stack to dust-chamber. 

 F', flue to dust-chamber. 

 G (G 1 ), damper. 



H, feed-holes. 



I, induction blast-pipe. 



J, branch blast-pipe from J. 



J', iron jacket to furnace. 



K, wind-bags. 



L, lead- pot. 



L', siphon. 



I, sliding valve of tuyere. 



M, cold-water conduits. 



M' , hot-water outlet. 



N, tuyere. 



n, tuyere-holes. 



0, cast-iron bed-plate. 



0', vertical flange of bed-plate. 



O", projecting horizontal flange on O (in 



circular furnaces). 

 P, cast iron pillars. 

 P 1 , feeding-floor. 

 Q, braces on C. 

 q, water-jacket clamps. 

 B, water jacket feeder. 

 B', maiu blast-pipe, feed of 7'. 

 r, brackets on O 1 . 



S' (<S")> sliding-doors of feed-openings. 

 s, outlet-pipes of E. 

 T, water-gutter. 

 T, blast-pipe, feed of/. 

 (, brackets of pillars. 

 U, slag-gutter. 



V, slag-outlet in water-jacket. 

 W, liood, 



W, chimney of hood. 

 X, fore-hearth. 

 X', hearth. 



T, cold-water faucets. 

 Z, tap-hole in V. 



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