. Journal . ed, after sintering, 3—4 ixsr cent, of ferrous oxidland slightly more after melting. The siiecilic grarittejafter melting, were 5187 and 5-193; the fuse<l prodm)was strongly magnetic. A similar deterininiitionmagnetic iron oxide (FcjO,) gave a nieltiiig-|X)int <j152r C. and an arrest-point at —1250 .—A. G. L. , Silicon and its influence on the electrical and mafMtproperties of iron. E. Kolben. Runils, f. Technik eriments on the influtariof silicon on the mechanical, electrical, and raproperties of low-carbon iron, are shown in the follottable :— Percentage of Bilicon— Mi
. Journal . ed, after sintering, 3—4 ixsr cent, of ferrous oxidland slightly more after melting. The siiecilic grarittejafter melting, were 5187 and 5-193; the fuse<l prodm)was strongly magnetic. A similar deterininiitionmagnetic iron oxide (FcjO,) gave a nieltiiig-|X)int <j152r C. and an arrest-point at —1250 .—A. G. L. , Silicon and its influence on the electrical and mafMtproperties of iron. E. Kolben. Runils, f. Technik eriments on the influtariof silicon on the mechanical, electrical, and raproperties of low-carbon iron, are shown in the follottable :— Percentage of Bilicon— Minimum Maximum Tensile stroiiKth in kilos. (sheets 0-5 mm. thick), per resistance, ohms Increase in resistance per 100* C. per of , walt£ per kilo Eddy currents, watts per kilo Permeability. B (or H = 140 0-0260-30 30-811-0 41-00-0015 2-51-317,600. The alloys 3-5 |>er cent, of siliconlow tein|)cratuiecoe(licient of resistance,it is proposed to use alloys of iron containing from t f0 ]>er cent, of silicon and up to 5 jicr cent, of alumininifor the manufacture of resistances capable of repladnnickelin. German silver, and similar alloys. The maproperties of iron are. on the whole, favourably influsby silicon, the watt losses being considerablyand the elTect of ageing counteracted, whilst thmeability is not much affected. The alloys are hodifhcult to work, and with 3 ])er cent, of silicon are brittle. The , whilst not of much conseqnwith resj)cet to the use of the alloys in transfon ,would preclude their employment in dynamos.—A. 8., Cyanide solutions; Precipitation of gold from j carbonaceous matter [in lime]. W. A. Met. and Min. S. Afric*. 1909. 9. 327— tests on the effect of partly burnt co«l icontact with a\iriferous <vanide solutions showed t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
