Annual report of the State Mineralogist for the year ending ... . w LEAD SMELTING. 841 THE FURNACES Used in Leadville belong to two styles, both built on the same generalprinciples. The difference between the two kinds is that one has arectangular and the other a circular cross-section. They are constructedupon the plan set forth in Fig. 44, with the modifications demandedby local peculiarities and the character of the ore. The material usedin their construction is: 1. Common bricks for erecting the outer walls and dust chambers. 2. Firebricks for lining of furnaces. 3. Cast-iron for the water
Annual report of the State Mineralogist for the year ending ... . w LEAD SMELTING. 841 THE FURNACES Used in Leadville belong to two styles, both built on the same generalprinciples. The difference between the two kinds is that one has arectangular and the other a circular cross-section. They are constructedupon the plan set forth in Fig. 44, with the modifications demandedby local peculiarities and the character of the ore. The material usedin their construction is: 1. Common bricks for erecting the outer walls and dust chambers. 2. Firebricks for lining of furnaces. 3. Cast-iron for the water jackets, etc. 4. Tapping clay. Fig. 42 represents a modern roasting furnace, drawn to scale. The charge is introduced at the flue end, through two openings, shownin cross-section C, D. It is spread over the bed and gradually moved towards the fireplaceG, H, which is separated from the working bed by a hollow fire bridge,shown in the plan and cross-section A, B. The furnace has nine working doors on each side. Through the twonearest the fire bridge, shown in se
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Keywords: ., bookcentury1800, booksubjectgeology, booksubjectminesandmineralr
