Bulletin . uous-feed furnaces, both coarse and fine-ore, the con-densers become more complicated and more extensive. Iron condenserslike the old style (see Plate XXXVII; also Photo ,) have been used, and though of small capacity may do with non-pyritic ores: but if appreciable amounts of pyrite are present, the sul- 256 CALIFORNIA STATE MIXING BUREAU. phuric acid formed attacks the iron. The Cermak-Spirek condenser^is a similar condenser, made with cast-iron pipes, and used at MonteAmiata, Italy. Up to quite recently, the condensers built with Scottfurnaces have been almost
Bulletin . uous-feed furnaces, both coarse and fine-ore, the con-densers become more complicated and more extensive. Iron condenserslike the old style (see Plate XXXVII; also Photo ,) have been used, and though of small capacity may do with non-pyritic ores: but if appreciable amounts of pyrite are present, the sul- 256 CALIFORNIA STATE MIXING BUREAU. phuric acid formed attacks the iron. The Cermak-Spirek condenser^is a similar condenser, made with cast-iron pipes, and used at MonteAmiata, Italy. Up to quite recently, the condensers built with Scottfurnaces have been almost entirely of brick. (See Photo No. 7, ante.)At New Idria they were built of stone, also in part of wood. (PhotoNo. 59.) Lately, wood has been substituted for their construction at theOceanic mine, San Luis Obispo County, the New Idria mine, San BenitoCounty, the JEtna mine, Napa County, and at the Cloverdale mine, PLATE XXXVII. c JC \^SSSS2^,SSS. w. ^w^ \^ a ?r. C, n \ J) I \ \ 4^ ^ \^ J> V —? Sca/e. J?Cr
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