. Mining and Scientific Press . ely what can be obtained for the prodi; led delivered at points on San Francisco Bay. These, of i v vitli the grade and purity of the ores. The present in of the market makes many of the quotations purely in be purchased at these prices, but It should be in that it is not easy for the producer to market them at this Antimony i Imately free of lead and arsenic, not lesa than 60c i ling to length of fibre, per ton 820 to 82500 Iree of iron (crude), par Ion 5 to 10 10 to 15 free of Iron, per ton 5 to 10 i fluoride, per ton 16 to 20 Full • to post mi mesh, per ton 5
. Mining and Scientific Press . ely what can be obtained for the prodi; led delivered at points on San Francisco Bay. These, of i v vitli the grade and purity of the ores. The present in of the market makes many of the quotations purely in be purchased at these prices, but It should be in that it is not easy for the producer to market them at this Antimony i Imately free of lead and arsenic, not lesa than 60c i ling to length of fibre, per ton 820 to 82500 Iree of iron (crude), par Ion 5 to 10 10 to 15 free of Iron, per ton 5 to 10 i fluoride, per ton 16 to 20 Full • to post mi mesh, per ton 5 to 10 Oraphlte, ? T--r pound 3c. to 7c 25 to 35 Manrai in than 8* SiO:. per too 26 to 30 nl . .. 1 to it., oi copper, per . 8 to 12 O-hr. to Rlremjth. crude, per Ion 8 to 15 Solpfa only trace of A» and Sc. per ton 16 to 18 lump, white per ton to 10 Tin ore. not li than 60% 8n, per % 8n 4 to 6 Tungsten ore. not less than 66% WO,, per % WO, to 3 00 Novi i i, r 12. 1921 MIXING AND S< I Mil l« I! 659. T. A. KICKARD. .... Editor „„ iiniiiiuiii iiiiiiiiiii ii iiimuli ii i i i I I III! ii n1 UNDER Discussion we publish a contribution on thesubject of recreation for the workers in mines andfactories The writer, Mr. P, B. McDonald, a graduateof the Michigan l if Mines, is the Assistant Pro English in the College of Engineering ofNew York University, and he oughl to be able to teachhis subject well, judging by his own care and skill inwriting. We welcome his letter as an example of scholarly expression and abo for its substance, for the Bubject of a proper kind of recreation for industrial workersis well worthy of serious study. WARREN NORRIS, a pharmacisl a1 Bisbee, Arizona,recently ted to the manufacturers of Ever- sharp pencils thai copper would bi a splendid materialto use in the making of their specialty; the idea wasaccepted at once. The metal is given a simple treatmentthat enables it to retain its lustre, and an attractivearticle is the result. I
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