The Mexican mining journal . psand by gravity and springs work best when seated onhorizontal seat. This insures the simplest mechanismfor opening and closing uniformly. For this reasonpumps can not be up-ended or mounted anyhow likern electric motor. A Inrizontal steam pump can nothe easily changed into a vertical sinker, which severalpractical men have found out at their own expense. Air Lifts The subject of air lifts is large enough for a separatearticle. It may, however, be said here briefly that ascompared with that of pumps the efficiency is verylow. Still economy does not altogether depe
The Mexican mining journal . psand by gravity and springs work best when seated onhorizontal seat. This insures the simplest mechanismfor opening and closing uniformly. For this reasonpumps can not be up-ended or mounted anyhow likern electric motor. A Inrizontal steam pump can nothe easily changed into a vertical sinker, which severalpractical men have found out at their own expense. Air Lifts The subject of air lifts is large enough for a separatearticle. It may, however, be said here briefly that ascompared with that of pumps the efficiency is verylow. Still economy does not altogether depend uponthe efficiency of any particular machine. For elevatingpulp the air lift has been found more economical thanpumps, for the reason that slime pumps of the ordinarytypes demand a never ceasing supply of repairs andextra parts due to the scouring action of the sharpparticles. Air lifts, on the other and, are free from allcomplications of valves, packing and liners and dotheir work with a minimum of attention and San Rafael Mining Co., Pachu;a, Hgo. j4ssay of Tin Ores and Concentrates. A series of tests which various minerals wereadded to tin ores and concentrates of known tin con-tent, and the mixture then assayed for tin by thePearce-Low method proved that the method is veryaccurate except when compounds of titanium, tugs-ten, or bismuth are present. The modification proposedwhen titanium is present, is to fuse the ore withpotassium bisulphate, and treat the melt with dilutesulphuric acid, when all the titanium goes into solu-tion and the residue, containing all the tin, is fusedwith sodium peroxide in the usual way. Tungsten, ifpresent with titanium can be completely removed bytreating the residue from the titanium solution withammonium carbonate. Ores containing tungsten mayalso be digested, after finely powdering, with sodiumhydroxide solution, when all the tungsten goes intosolution. When tin ores contain bismuth, the bismuthis precipitated by the nickel. As
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