Bulletin . or the purpose of keep-ing this part cool so that it will not warp on account of the heat of theretort. This retort could also be used to treat limited tonnages of high-gradeore at a small mine, Avhere only a small amount of capital is availablefor equipment. The Whitton furnace, invented by W. W. Whitton, Oakland, Cal,(U. S. Pat. #1,222,251, Apr. 10, 1917) is a multiple, vertical, continuoas-feed retort, consisting of a series of any desired number of pipes from4 to 17, arranged with a draft circulation to a condenser 17-tube furnace is estimated to have a capacity of
Bulletin . or the purpose of keep-ing this part cool so that it will not warp on account of the heat of theretort. This retort could also be used to treat limited tonnages of high-gradeore at a small mine, Avhere only a small amount of capital is availablefor equipment. The Whitton furnace, invented by W. W. Whitton, Oakland, Cal,(U. S. Pat. #1,222,251, Apr. 10, 1917) is a multiple, vertical, continuoas-feed retort, consisting of a series of any desired number of pipes from4 to 17, arranged with a draft circulation to a condenser 17-tube furnace is estimated to have a capacity of 25 tons perday, and to cost from .$6,000 to $8,000 installed. The Pevear furnace has been developed by Waldo S. Pevear, #315^W. 2d St., Los Angeles, Cal., patent for which, the writer understands,is now being applied for. It consists of a series of revolving circular,cast-iron chambers with interior-projecting lugs or teeth like the old- PLATE XXVI. IRON CLAD SHAFT FURNACE CONTINUOUS) SECTION A B. ELEVATION. HORIZONTAL SECTIONS. Exeli Furnace. 220 CALIFORNIA STATE MINING BUREAU. fashioned thrashing-machine cylinders. It requires that the ore becrushed as fine as 10 to 20 mesh. On such material, a practically com-plete distillation of the mercury is claimed in a very short roastingperiod. COARSE-ORE FURNACES. Coarse-ore furnaces, as the name indicates, are built to treat coarseor lump ore. In construction and method of operation they are sim-ilar to an ordinary, vertical-shaft, lime kiln, and the ore as fed to themmay vary from 3 to 9 in size. The principal varieties of this type ofquicksilver furnace, which have been used to any extent are the Exeli,Knox-Osborne, Neate, and New Idria. Some fine ore can be, and attimes is, charged with the lump ore; but it should be done sparingly,as it would otherwise choke up the spaces between the ore chunks andprevent circulation of the products of fuel combustion. The additionof any fine ore is apt to materially reduce the capacity of a coa
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