Bisbee daily review., 1914-02-22

scale. It was round that the cor rosion took place on the under side only, that being the side exposed to the fumes and flue dust Practically all the salts and scale went into solu- tion. These were found to be prin- cipally zinc sulphate. with a trace of iron and trace of chlorine. The quantity of sulphuric acid was only sufficient to combine with the zinc and copper found to be present; there appeared to be no free acid An ex- animation of the corrosion suggested' electrolytic or galvanic action. and the following tests were made to prove this:
 T. Pieces of sheet iron and copper were immersed in chemically pure zinc sulphate. On connecting them with a voltmeter a current was reg istered.
 2. A piece of the original corroded roofing was placed salt side down on piece of sheet iron The sheet iron and the smooth copper surface were connected: A gain current was registered.
 3. Chemically pure zinc sulphate in a dry state was placed between a piece of sheet iron and a piece of cop per. This showed current only when heated and when moistened.
 1. Fine fue dust was substituted for the zinc sulphate. This also showed no current except when moist
 K Thinking that the iron would not necessarily prove a factor in this corroslon, the chemist connected the salts on the corroded side with the bright surface on the other. and found an appreciable current This also was greatly increased by moisture.
 6. A piece of sheet iron with moist zinc sulphate showed an appre, ciable current but not as much as with copper.
 The conclusions drawn from these tests show. without doubt. that the corrosion was caused by galvanic ac. ton which was increased with the in. crease of temperature and moisture present.
 It is valuable in notifying the smelt- CT world that copper as a roofing for Hue dust chambers is not the ideal material that 1t was formerly sun. posed to be. It is by such expert ments. however, that these things are developed
 The Converter Department.
 n the big converter room with its 55-foot aisle there are six converters of the Great Falls type. where the final blowing up is done. There are 24O-ton electric travelling cranes that handle the skimmine end of this DOT. tion of the plant, taking care of the slag. etc. With the wind from the south there are some fumes notice able hero. as the main fume convey or Is a little small due to the desire to use as much of the old plant as pos sible Another stack. the material for which is all being taken from the old shelter is fast being prepared and when in place will effectuallv take care of all the fumes from the con. verter room. lt is a fine. roomy build ing well lighted and ventilated. as good ns can he found anywhere.
 Pouring the Copper lnqots.
 There are two pourers here, one man on shift caring for the work. The moulds are held on a continuous chain. As one mould is filled the op- orator moves the line forward one mould fills. and again proceeds The metal cools rapidly. jets of water from overhead pipes assisting. and after travelling a distance the ingot is dnmped into vat filled with water, beinr automatically kicked out of the mould!' From the vat 1t Is again drawn by steel. open frame and fin. ally deposited on a steel sheet that runs it to the trimming and weighing hoor. and where 1t generally gets into the box cars for shipment while still hot
 lt Is Real Money.
 And every time copper ingot cones sliding down to the weighing and trimming floor it represents a if "-dollar hill or fifty dollar gold niece that being about it's value at the nresent price of the metae and the ineots drou pretty fast. On the goth day of January the total of blis. ter coDper made was 324.O0O pounds ar l62 tons This was the record per formance m to that time and is bet ter than the daily average by consid. erahle It simnlv shows the capacity of the plant with only two reverbera. tories running
 A slag breaker hammers up the drippings about the converter floor These being sent to the ore beds. CALUMET & ARIZONA GAL 4
 The Waste Slsa
 The waste slag is being dumped close to the shelter where the pres. eRt accommodations for it will be all that is required or five or six years. In the meantime there Is a demand for this waste. Crushed il makes very line covering tor the rosd ds of this section. Undoubtedly some of it will De employed on the road being im- proved between Douglas and Bisbee. There's considerable clay on this highway and the crushed slag mixed well with it makes a pOOd lCug-Wear-