Show SCIENTIFIC Sc MISCELLANY A remarkable test teu of copper tibia in Iii a ii locomotive boiler hits has been d des described s by I F W Webb The Tho holier boiler re ra received a set of III tubes by 10 i makers the tubes being at ranged arranged In iii groups of 10 oC of different kinds eo so ns as to give similar treatment to all and the en engine glue gine was taa run 1 miles In a period of ton eli months Time The first tubs tube foiled failed nt rut miles tho lie second of the tho same name make at miles all tubes of the tame typo type being bein removed after the lie failure of two host type showed no lie failure until after miles The Tho failures with on one exception were veto at the of the tub tubes s and within six incites inches of the lie box end Analyses Indicated that the best tubes contained either oither three p ier r c cent nt of nickel or nt at least Eva per e nt of arsenic and copper tubes hardened with nickel ore being tested on n ii loathing leading English road The mystery of magnetism Is not by Dr P F discovery that magnets may b be made by hi oom bluing bItting nonmagnetic motels metals Tim The mag of a tool of and andIn tin In wan van accidental and ex lien showed other magnetic alloys one c of f manganese aluminum and cop copper per rivaling cast Iron In Its magnolIa magnetic properties Other Interesting facts have havo been e n mag maglet let for example loosing its his magnetism al at degrees F The of V I hoed Is a iv hy by element sup io l to be all allIed d to lanthanum It colors bottles violet causen to romo brown MCI altI crumble anti reaches Its greatest activity In a month after precipitation from At to Isolate It front from lanthanum reparations are being made madeAn madeAn An for satisfying of the properties of new IH hi a chemists idea den Many substances besides carbon lavo been by 0 C I 1 a electrodes for are arc lamps II lie finds find that magnetite the black oxide ot of Iron Is specially especially suitable HH as It conducts well u Is I stable at all temperatures Is very sery plentiful In nature anti and gives n a white Leo Ere of much higher efficiency the carbon arc U It forms form lie chic lic the positive a copper leg meat of such else ulie that It does doa slot not wear away from yet u com B hot to prevent the i lion Ion of fused drops of from remit the ho negative electrode Time burnt burns nt at time rate of an eIghth of an I Bolt AH an hour the rate of the llamas Ito re being front from one to two incites Inches per lust hour und and with small sacrifice of et ef the addition of substances Ilka blk titanium compounds reduce the thie burn burnIng Ing of the he magnetite eo so that nn nut eight inch electrode may 01 be produced list will last MO 00 or hour |