INDEX OF LETTERS USED ON PLATES. 



A, crueiblo. 



A', interior of crucible. 

 A", (lam of crucible. 



a, sheatUiug of crucible, 

 a', sheathing of lead-pot. 



B, water-jackets. 

 B', slag-pot. 



b. fire-brick above water-jacket. 



C, masoury of shaft of furnace. 



C, walls of shaft of furnace. 



D, chimney. 



D', dust- chamber. 



(1, sheathing on top of crucible. 



£.", stack. 



F, stack to dust-chamber. 



F', fluo to dast-ohamber. 



G (G'), damper. 



IT, feed-holes. 



/, induction blast-pipe. 



J, branch blast-pipe from /. 



J', iron jacket to furnace. 



E, wiud-bags. 

 L. lead pot. 

 L', siphon. 



I, sliding valve of tuyere. 

 M, cold-water conduits. 

 M', hot-water outlet. 



-V, tuyere. 



H, tuyere-holes. 



0, cast-iron bed-plate. 



0', vertical flange of bed-plate. 



0", projecting horizontal flange on O (in 



circular furnaces). 

 P, cast iron pillars. 

 P', feeding-floor. 

 Q, braces on C. 

 q, water-jacket clamps. 

 B, water-jacket feeder. 

 B', main blast-pipe, feed of T' . 

 r, brackets on 0'. 



S' (S"), slidiug-doors of feed-openings, 

 s, outlet-pipes of B. 

 T, water-gutter. 

 T, blast-pipe, feed of /. 

 /, brackets of pillars. 

 U, slag-gutter. 



r, slag-outlet in water-jacket. 

 TF, hood, 



W, chimney of hood. 

 X, fore-hearth. 

 X', hearth. 



r, cold-water faucets. 

 Z, tap-hole in V. 



751 



