Bulletin . silver is comparatively easy to volatilize, its distillation temper-ature being 360° C. or 680° F. The Scott furnace, when properly con-structed and carefully operated has apparently proven to be an efficient Spirek, Vincenzio, The quicksilver industry of Italj; Min. Industry, Vol. 570, 576, 1898. (^LICK^-IIAKK RfXJLRCES. 257 a^ent for expelling this metal from its ores; but onee we have thisprecious substance in its vapor form the fun i)egins when we tr\- to getit l)ack into a cdllectablc condition. Retort condensers. With retorts, particularly the Johnson-]\IcKay arrangemen
Bulletin . silver is comparatively easy to volatilize, its distillation temper-ature being 360° C. or 680° F. The Scott furnace, when properly con-structed and carefully operated has apparently proven to be an efficient Spirek, Vincenzio, The quicksilver industry of Italj; Min. Industry, Vol. 570, 576, 1898. (^LICK^-IIAKK RfXJLRCES. 257 a^ent for expelling this metal from its ores; but onee we have thisprecious substance in its vapor form the fun i)egins when we tr\- to getit l)ack into a cdllectablc condition. Retort condensers. With retorts, particularly the Johnson-]\IcKay arrangement, fre-quently the condenser is simply a 3^-inch pipe, 7 feet long (see PhotoNo. 62), open to the air, as at the Patriquin mine. ^Monterey County;or the exit ends may deliver into a closed box (being often soarranged) ; or further elaborated upon and extended into other con-denser chambers and flues with a circulatory .system as at the SulphurBank mine. Lake County (see Photo No. 63; also Photo No. 41, of. Photo No. 58. Condensers at New Mercy (Pacific) Quicksilver Mine. Fresno County. ^Etna mine retort, ante). In the tirst case above-mentioned. Patriquinconsiders that complete condensation is obtained with the arrangementas it stands. He points to the fact that after the steam ceases to comeoff (about -to to 60 minutes after charging), that the condenser pipe iscool up to within 18 to 2-t from the retort wall. Also that, at onetime for awhile, he had a cover over the ends of the condenser pipes asa safeguard against theft, during which period the pipes were alwayshot for their full length, and mercurial fumes could be detected coming 258 CALIFORNIA STATE MINING BUREAU. from the end of the box. With the present, open arrangement, exceptfor the steam already noted, there are no visible fumes nor noticeablemercurial odors. It does not seem reasonable to expect that condensa-tion could be complete in so short a distance. This point can bedefinitely determined only by sampling an
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