Chemical engineering . 2. then receding a fraction. The expected recovery be-gan about the 21st. the closing price on July 31 being £,and further rises are now expected. Copper rose steadilythroughout the month to £ per ton, anil the indicationsto-day point to further rises. Tin has the sensationof the month, touching the phenomenal price of .£151 perton on July 26, a rise of over .£12 in twenty-three days. .\slight fall to £149 took place by the 31st. but prices are hard-ening again, owing to shrinkage of supplies and the well-maintained demand. Lead has been firm in pr
Chemical engineering . 2. then receding a fraction. The expected recovery be-gan about the 21st. the closing price on July 31 being £,and further rises are now expected. Copper rose steadilythroughout the month to £ per ton, anil the indicationsto-day point to further rises. Tin has the sensationof the month, touching the phenomenal price of .£151 perton on July 26, a rise of over .£12 in twenty-three days. .\slight fall to £149 took place by the 31st. but prices are hard-ening again, owing to shrinkage of supplies and the well-maintained demand. Lead has been firm in price, closing at£ for ingots. Quicksilver is fetcliiug from £. to£ per 75-pound flask. London, .Vug. 5, 1505. ANALYSIS OF CURRENT ELECTROCHEMICAL PATENTS. Electric Furn.\ces. Elcclru- Fiin:aci:—F. A. J. and P. McX. Bennic,792,255, June 13. Application filed Dec. 3, furnace chamber, shown in Fig. i, is divided into anydesired number of independent compartments 9. 10. separated. -^^^^ FIG. I.—ELECTRIC FLRNAtE. by refractory walls. These walls comprise resistors 11 andrefractory facings 12 which may be of the same character asthe lining 6. The several resistors 11 are connected elec-trically in series by resistors 13 placed at opposite ends ofadjacent compartments. The principal terminals are at 16 is an auxiliary terminal. Producing Tungsten Steel.—E. D. Kendall, , July 25Application filed May 31. of tungsten ore are granulated and mixed withmetallic zinc dust and fragments of iron, free from mixture is treated in an electric furnace. The escapingzinc oxide fumes are collected in an outside chamber. Electric Furnace.—H. N. Potter (assigned to George Wesi- inghouse), , Aug. 22. Application filed July 2.!. 1903- Claim 3 is for the method of reducing the terminal voltage of a conducting gap, which consists in subjecting the said gap to the influence of great heat. The in
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