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Show lllG ENGINEERS Conserve and Use Substitutes, Substi-tutes, Is Advice of Experts Ex-perts in Conference. MILWAUKEE, Wis.. Oct. 9. A clarion call to conserve tin, which may be heard ' around the world, was sounded here today at a. meet ins of the Amen- can Institutp of Mining JOnincers when 1 representatives of the government and many of the country's largest firms con- ferred. 1 Collect tin for oir use, s'lhstitute oilier j metals for tin wherever possible, and dis-continue dis-continue the manufacture of tin-consuming products essential to the winning of : the war. These were the advices marie 1 public after the conference. v 1 Those in attendance represented the war I industries board. National Ivead company, j Pennsylvania railroad. United States bu- j reau of standards, American Sheet & Tin 1'late company, Westinghouse Klcctric & , Manufacturing company and several J scores of others. ' Conserving: tin was the principal sub- ! Ject of the conference, tog-ether with a study of means for increasing the byprod- ; ucts of coke ami the fuel supply in the United States. The statement was made that from certain coals it is now possible pos-sible to secure noarly twenty gallons of gasoline or motor fuel of the same value per ton of coal mined. A mong other things, a new type of coke, known as semicoke. has been produced, which, it is Paid, has proved a satisfactory fuel for all general purposes. The advan- lages of using coal in pulverized form or of using briquets, or a new fuel, known , as carbocoal, were discussed at some : length and In several Instances statements were made showing that enormous sums have been spent in order to make these ; substitutes for coal available to the domestic do-mestic and industrial consumer during the coming winter. Today motion pictures wore shown before be-fore the. engineers in regard to concrete ; ships, rlointing out the important part which ships are playing in the life of the world; the paramount importance of cripples in the manufacturing industries, : indicating the wide uses that can be made , of them in the mine world, and the triplex steel process. At the Institute of Metals, division of the Mining Engineers Institute, the following fol-lowing subjects were presented in the course of the day: j "Conservation of Tin." "The Volatility of the Constituents of , Brass." by John Johnston. "The Effect of Impurities on the Hard- nss of Cast Zinc or Spelter," by C. C. S.tone. ; "Dental Alloys." j "Electrolytic Zinc." 'y, C. A. Hansen; with discussion by J. . McK. Vardley. "The Condensation of Zinc From Its Vapor," by C. H. Fulton. ! "The Action of Reducing Gases on Copper.' Cop-per.' by Nnrman B. Pilling. At tho iron and steel section meeting th following subjects were presented: "The Byproduct Coko Oven anil Its Products," by W. H. Blauvelt; with uis- t cussion by A. K. McCc?h. "Tho Use of Coal in Pulverized Form," 1 by H. ft. Collins. "Carboco.il," bv c. T. Malcolmson: wiih disrijHsion by V. Rowland 1 'ox, X M. Fitzgerald, Newell V. Roberts. V. 11. Warileigh, Charles Catlett and Charles M. Barnett. "ljow-teniperature Distillation of Illinois and Indiana Coal," by ;. V. Traer. "Price-fixing of Bituminous Coal by the Ur.ileri States Fuel Administration," by Cyrus Garnsey, R. . Norris and J. II. Allport. The metintr of the iron nnd Me el section sec-tion closer! todav and the irce'iinr of the Institute nf M'Hp.is division will .lose to-, morrow, following a session in tin? morn-Ink- ' I |