C—ls

The analyses of the products obtained were as follows : — Pig Iron (before addition of Ferro-silicon). Per Cent. Carbon by combustion .. .. .. 3-155 Silicon * .. . .. .. .. 0-070 Sulphur .. .. .. .. .. 0-017 Pig Iron (as Cast). Graphitic carbon .. .. .. .. 2-4191 rr ~ , „ „,, Combined carbon o .g Bo | Total carbon, 2-799. . Silicon .. .. .. .. . . 2-308 Sulphur .. .. .. .. .. 0-010 Phosphorus .. . . .. .. 0-279 Manganese .. .. .. . . 0-237 Titanium .. .. .. .. .. 0-093 • Slag. Silica .. .. .. .. .. 20-62 Titanic oxide .. .. • . . .. 13-34 Alumina .. .. .. . . .. 8-50 Ferrous oxide . . .. .. .. 3-54 Oxide of manganese. . .. .. ..1-10 Lime .." .. .. .. .. 35-47 Magnesia .. .. .. .. . . 16-57 Phosphoric anhydride .. .. .. 0-11 Heat 11. This heat followed on immediately after the last heat had been teemed. The composition of the charges was similar to that used in heat 10 and was as follows: Ironsands, 6001b. ; coke-dust, 701b. ; coke-breeze, 401b. ;, lime, 50 lb. The materials were intimately mixed as before. In this heat, however, three charges as above were put in with intervals of approximately an hour between each. The reduction of the total charge of I,Boolb. of ore was complete, and the slag tapped after 5 hours 20 minutes. For earburization 23 lb. of carburite and 42 lb. of coke-dust was used, and later 10 lb. coke-dust was added, and was completed in 2 hours 5 minutes; 991b. ferro-silicon was then added, and the metal tapped after a total run of 8 hours 12 minutes.

Electrical Measurements. — Heat 11. Date: 26th August, 1921.

2—o. 15.

9

Time. Volts. Amps. ■Watts. No. 1. Units. Remarks. No. 2. 11-45 11-55 12-00 12-15 12-30 12-45 12-57 1-15 1-30 1-45 2-00 2-01 2-30 2-45 3-00 3-15 3-20 3-45 4-15 430 4-45 5-00 5-45 615 6-50 7-15 7-52 494,657 494,657 7 504,862 First charge. Full tap. 160 154 160 164 2,600 2,500 2,500 2,450 360 360 360 360 494,828 194,828 3 505,050 Secondjeharge ; off for 7 minutes. 154 164 162 162 2.500 2.350 2,500 2,400 365 370 365 365 494,981 194,981 I 505,207 Third charge; off for 15 minutes. Off for 2 minutes. 156 166 150 155 2,500 2,350 2.600 2,500 360 370 375 365 160 160 168 150 2,500 2,400 2.300 2,550 355 365 375 375 Off for 15.minutes ; boil-over. 495,374 195,374 Off for 6 minutes. 1 405,621 Off for 33 minutes, slagging. 100 94 100 100 Off 1,800 2.300 2.050 2.050 185 205 200 195 Off for 13 minutes. 4 195,525 Off for 14 minutes. 5 505,790 495,525