Bulletin . water-cooled tube. The mercury con-densed in this way coalesced readily and the amount ap^earing in theform of soot was in all cases less than 5% of the total mercury recov-ered. These experiments, together with the points mentioned above inspeaking of condenser operations, point to the desirability of devisinga. practical method for the rapid cooling of quicksilver furnace gases. 274 CALIFORNIA STATE MINING BUREAU. Because of its susceptibility to closer regulation, it would seem thatbetter eonibustion could be attained through the use of oil as fuel thanwith wood. Landers^- consid
Bulletin . water-cooled tube. The mercury con-densed in this way coalesced readily and the amount ap^earing in theform of soot was in all cases less than 5% of the total mercury recov-ered. These experiments, together with the points mentioned above inspeaking of condenser operations, point to the desirability of devisinga. practical method for the rapid cooling of quicksilver furnace gases. 274 CALIFORNIA STATE MINING BUREAU. Because of its susceptibility to closer regulation, it would seem thatbetter eonibustion could be attained through the use of oil as fuel thanwith wood. Landers^- considers that Fuel oil, such is u-sed in California needs a great amount of air for completecombustion and has the disadvantage of making a very greasy soot that is carriedover into the and greatly retards the collection of the mercury. To preventthis, it is necessary to have large fire boxes in which the combustion of the oil cantake place, allowing only the hot gases to escape into the 1 4 Photo No. 66. Cleaning up one of the new, wooden condensers at NewIdria. The bright globules of metallic quicksilver and the gray mudmay be seen on the discharge lip. In contrast to this, is the result at the Great Eastern mine, SonomaCount}^, where wood has recently l)een replaced by oil as fuel. It isstated that whereas before the change considerable soot had to behandled and was retorted, now a few buckets of drv dust are obtained Landers, Wp. 632, 1916. The Smelting of mercury ores: Eng. & Min. Jour., Vol. 102, QUICKSILVER KKSOURCES. 275 in the first condenser, only, and it is not necessary to nui the , too, with an ore carrying a noticeable anionnt of natural the composition of soot will vary according to the time andplace of sampling, analysis of a typical sample of soot at the New Idriamine (January, 1917) showed: ^Mercury 6S% ; silicates 21 ^t ; smallamounts of iron oxides, lime, soluble sulphates, and occasionally a lit-tle carbon. The
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