688 GEOLOGY AND MINING INDCTSTEY OF LEADVILLE. 



;i source of trouble and , j^jlau should be coudeuined altogether. The furuace is 

 worked with uine tuyeres,' '^ iucbes iu diameter at the uozzle, iuserted,as usual, in the 

 water jackets; one of the tuyeres is placed in the back jacket and four on each side. 



Each jacket is not only provided with inlet and outlet ])ipes for the circulation of 

 water, but a general circulation has been established between all the jackets by means 

 of pi|)es screwed into them at the base and communicating with one another. 



Dust-chambers. — The system of condensation of lead fumes adojjted at this smelter 

 is poor, and "leading" is consequently of frequent occurrence. The four furnaces 

 are connected by means of the sheet iron flues F' F" F'" F" with the sheet-iron 

 chamber M, connected by means of the brick Hue N' with the stack F (in Fig. 1, Plate 

 XXXVlll). The sheet-iron chamber has already been seen iu transverse elevation 

 (Fig. -', Plate XXXYII). Neither chamber jl/uor ^^is divided into sections, so that 

 the condensation of fumes is very imperfect. Both chambers are pi-ovided, as usual, 

 with sliding doors d for the extraction of the dust. 



At smelter H, Hue-dust is mixed with Hibernia ore (an argillaceous ore contain- 

 ing no lead) and introduced afterwards into the composition of ore-beds. 



Smelter 1 is erected on the northern bank of California gulch, in a situation so 

 similar to that of smelter C that the general description of the latter applies woixl for 

 word to these works. The only peculiarity at Smelter I is that the furnace and feed- 

 ing-floor levels are connected by a vertical elevator used for hoisting slags to be 

 resmelted. This elevator is placed iu the main building. The boilers are worked at 

 a pressure of 70 pounds to the square inch. The machinery consists of a GO horse- 

 power engine, two Baker blowers, one Blake crusher, and the puQip. 



The slag-pots are independent of the cars and are identical with those which 

 have been described at smelter A. The smelting plant consists of two Piltz furnaces, 

 identical iu capacity, shai>e, and dimensions, and constructed by Messrs. Fraser & 

 Chalmers. These furnaces are similar to furnaces of the same ])atteru used at smelt- 

 ers B and H, but have only one slag spout. The water-jackets B also are made in 

 but two sections, and the frame of the crucible of four cast iron i)]ates, segments of a 

 circle. One of these furnaces is shown iu elevation iu Fig. 2, Plate XLY. It may be 

 seen that each Baker blower, TF, is iu direct communication with the iuductioupipe I, 

 the general system of connecting all the blowers with a main blast-pipe not being in 

 use here. 



The system of condensation of lead fumes consists of a sheet-iron box, D', 8 

 by 8 feet, and 10 feet high, i)rovided with a sheet-iron stack, F. Each furuace is con- 

 nected by means of a sheet-iron flue, F', with a similar chamber, from which the dust 

 is extracted through hinged doors (V. The amount of flue dust caught iu both cham- 

 bers is about 5 tons per week. The dust is mixed with milk of lime, the mixture is 

 dried and then resmelted gradually with the smelting charge. 



The smelting capacity of the works is about -40 tons per twenty four hours. 



S.MELTEU J. 



Smelter J is a well constructed smelter standing on. the southwestern bank of 

 Big Evans gulch, and is disposed exactly like smelter B, with this ditierence, that the 

 offices and laboratory stand on one side of the main smelting building instead of beii g 



