Engineering and Mining Journal. 365
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Deo. 8, 1881.] THE ENGINEERING AND MINING JOURNAL. 365 influence in promoting the interests of the miner and the metallurgist, ENGINEERING and MINING JOURNAL. and concludes with a comparison of the railroad lines subsidiary to min- VoL. XXXII, No, 28. ing in 1870 with those of 1881. While admiring the magnificence of en- terprises which involve the laying of the iron path ‘on a graded bed, which must be built on terraces, piled up against the sides of steep cafions, RICHARD P, ROTHWELL, G.E., M.E., t Editors. or tunneled out of the mountains,” in order to reach a scanty and ever- ROSSITER W. RAYMOND, Ph.D, shifting population, one is tempted to ask, Is this railroad construction, Nore.—Communications relative to the editorial management should be addressed to RiIcHARD P. RoTHWELL, P.O. Box 1833, New York. or is it railroad frenzy ? Communications for Mr. RayMonpD should be addressed to RossiTER W. RayMonp, P.O. Box 1465, New York. Articles written by Mr. Raymonp will be signed thus * ; and only for articles so signed is he responsible. THE present time is one in which, more than ever before, attention is SUBSCRIPTION Price, including postage, for the United States and Canada, $4 per annum ; $2.25 for six months: all other countries, including postage. $5.00 = 20s given throughout the country to concentrating machinery, and numer- 25 francs = 20 marks. All payments must be made in advance. Parties accepting any other than our official receipt for subscriptions, from agents, do so at their own risk. ous-devices of more or less merit are brought to the attention of the Advertising Rates.—See page 384. mining public. Inventors and their representatives generally seem to Mr. D. B. Rich is our accredited representative for New York, Boston, and the Eastern consider an enumeration of good mechanical points and the exhibition States, and may be addressed at this office or 57 Clarendon street, Boston. Mr. J. Viennot, 407 Walnut street, Philadelphia, is our accredited representative for of a series of bottled samples sufficient to prove the efficiency of their Pennsylvania, Maryland, and Delaware. apparatus. We do not wish to say that they are to be blamed for so Mr. A. H. Taylor, 159 Lake street, Chicago, is our accredited representative for Chi- cago and the Northwest. doing ; the chief responsibility probably lying with buyers who have not Mr. Sidney G. Sherwood, 19 South Division street, Buffalo, is our accredited repre- sentative for Buffalo and vicinity. been educated to judge of the performance of such machines. Often Mr. L. Waterman, Jr., Room 15, Pike’s Opera-House, Cincinnati, O., is our accredited they are content to have atrial of a few hundred pounds made; and representative for Cincinnati, O., Louisville, Ky., and vicinity. REMITTANCES Should always be made by Post-Office Orders or Bank Drafts on New upon finding that the tailings will run only so and so many dollars, York, made payable to THE SCIENTIFIC PUBLISHING COMPANY. while the assay of the concentrates was in the hundreds, promptly THE SCIENTIFIC PUBLISHING CO., Publishers, issue their orders. Neither party does justice to itself; and in conse- P.O. Box 1833. 27 Park Place, New York. quence, both are sufferers from asystem which might easily be improved. As far as slime-tables are concerned, the matter is a simple one, the only CONTENTS, points to be accurately determined being the weight and assay of the ore to be dressed, the dry weight and assay of the concentrates, and the en : vagal The e Mining n of Anthracite Coal 1 and — weight and assay of the tailings. Then even a person not at all familiar History and Political Science in Cor- | : a s* nee - ae eeeait) | MMROM seth os siois cic sisssnaeeenss:ec 373 with the subject can calculate readily just what the machine is doing. nell University...... .-0.s.c02sseee 365 | sre Br ieisittii on The Rio Tinto Company, Spain ; ..... 365 | The cee Formation a of — Coal]................. ea a ¢ Notwithstanding the fact that such a test is inexpensive, and would ap- entila’ sh Collieries.... .. pear almost self-evident, it is but rarely resorted to by either buyer or Letters from the West............ ..- 365 AN , a ae . = ee Drill . a ovel Met oO argin rill- seller. The necessity for such experiments becomes much more urgent, Hints as to Concentrating Machinery 365 _ Tens “ however, when three products—concentrates, middlings, and tailings Mr. H. ©. Burchard on the Silver | MM tanics Rachie sy iemeuae Acbewden 7 . ‘ 5. | COMES ROO TODONE <i. 5555. 6ssc ss cons 374 —are made. In such a case, a bare statement of the assay value or coin CIO sonic sincns oe os . 365 | “i i 7 i CORE PEMAG NOG. x ooncic iis cscwesaccckes 375 value per ton of the concentrates or of the tailings, or both, is absolutely The Tariff Convention........ ....... 366 ee A ch Ma MONIT <5 vag seseaws sueceendeaces 377 valueless. As soon as buyers insist upon full and accurate returns, Man’s Origin and Destiny........... 366 : ; apy | GENERAL MininG News: the makers of this class of machinery will learn to meet the demand, The Pennsylvania Survey Reports .. 367 | : z ‘ RPMI ss is dnc ccsg css neessaccanss sean 377 and both will be gainers. Letters from the West.--I........ ..... 368 | : . 5 wee f° EPROM <6 caine ss Scsgs a snnceceenes 377 Dolomite for the Manufacture of Mag- ’ 369 | IES 5h Sonn cccie. Sicasseccasene 377 EveEN Mr. Horatio C. BurcHARD, Director of the Mint, who has been Daa pte et a oer ea Sy cea = ; IN ic a: Sais Son dencaeviee sea ees 377 an enthusiastic advocate of the present silver law, is reaching the convic- The Basic Bessemer Process at Witko- ae 200 M55 <a oo is cas, olde ese a asa eeen 378 tion that its enforcement is calculated to do serious injury to the business witz. a as is aia : : : ss eeeiabiatnees = I iS Ea pct A ak 378 interests of the country, and that in view of the failure of the Paris Mon- Bertha Zinc ” and Spelter.. capac 7 RNa os coe he dices 378 etary Conference and the possible demonetization of six hundred and fifty The Distribution of Elements in Steel ro 5 af TN 66 apc Seies sseiseats ds etapes 37 millions of dollars in Europe, it will be dangerous to continue the com- > pene oe renrnces a a git oe le 37 pulsory coinage of twenty-four millions of silver dollars every year Se aha Renee | MMS © ctisciicrcdcnee 378 Mr. BURCHARD’S views may best be expressed by the following abstract gsi caaaae names ey Be ERE re ede 378 from his report : Ts CN FI so ono visisccsiccccicewes 71 ri : - fy WMI cr sa“recnwaas cutecc ok cous 37 PROGRESS IN SCIENCE AND THE ARTS: | ‘“‘The International Monetary Conference which met at Paris in April last FINANCIAL : instructively discussed the subject of a common ratio in the coinage of gold and silver, but no practical conclusion was reached. Delegates from several European Blasting under Water.... .... ....... 372) Gold and Silver Stocks........ ...... 379 countries gave little encouragement for the expectation of any effective aid from Petroleum in Iron-Making........ ... 372] Copper and Silver Stocks...... ..... 380 their governments in the effort to restore silver to its former place in the mone- Recalculation of the Atomic Ci SIREN ooo ck ces, clases 360 tary circulation. The hope, however, seems to have been entertained that fur- ther deliberation and a consideration of the inevitable complications and disturb- Weights.....-...-.- 60 ee seeeee eens MT CMMI, ap onivnnes se ccterscs ‘Sises 0s ances to commercial exchanges between Asiatic countries and the western world. NorEs : BULIIOW MAGERT. <..ccccincs ceccavesce 381 to be feared from the exclusion of silver from coinage will enlist the co-operation of those nations in this, possibly the final effort, to retain silver conjointly with Tron Ore in Cuba............-......+. 372| Philadelphia Mining Stocks.......... gold as a measure of values. In view, however, of the failure of the Confereuce The Ligonia Rolling-Mill............. Oe MMMM sc oe acnp bo.c os banraceceleevets 381 to agree upon any practical measure, and while awaitiug its future action, it isa question for our serious and early consideration whether it is not desirable to Standard Shapes of Iron and Steel.. 372 | IRoN MARKET REVIEW...........25 cesses 383 suspend the further coinage of silver until by international agreement and effect- The Standard Oil Company's Pecu- Coat TRADE REVIEW.. .........s0..02+008 384 ive legislation the unlimited coinage of silver and gold at a common fixed ratio shall have been authorized by the principal commercial nations of Europe and ee I ons iscves cacteredscaccss Fie | PRBIOMND ooiscc se ccccss scenes ‘ . 384 America. i oe : The Hardie Compressed-Air Loco- STATISTICS OF COAL PRODUCTION..... .. 384 ‘The United States has done its part toward retaining silver as a monetary MN aaa sDivcaeciear sre. spec 372 | Assay DEPARTMENT........ agent in measuring and exchanging values. For three years, it has appropriated 378 to coinage purposes one third of the world’s production of silver, and maintained The Koerner Fire-Damp Burner....... 372 | Advertisers’ Index.--..-......-.-..- x its average bullion price nearly to the average of 1878. As was said in my first report : ‘Should the $650,000,000 of silver coin, now full legal-tender in Europe, WE learn from be demonetized, the United States could not, single-handed among commercial Cornell University that a complete course in history nations, with no European co-operation or allies, sustain the value of silver from and political science has been organized there, in imitation of those the inevitable fall.’ With that danger menacing us, we can not, without serious already established at Columbia College and embarrassment, continue such coinage, unless other commercial nations will Michigan University.