β Scribed by Dhar, N. R. ;Chatterji, A. C.
No coin nor oath required. For personal study only.
using aiinunlly about 100 tons of cupro-vanadium (5-13% 1 ' ) to make acroplane propcllcr bushings, boat propcllcrs, and the l i c , having specially high strength and rcsistnucc to corrosion. An aluiiiiiiiuin-2.anadilliii alloy (nbout 10% 17) is used to stiffcn tlic nluiiiinimn frainemork of ncroplanes, as me11 as in piston rings, genr boscs, ctc. Vanadium substitutcd for iiiaugnncsc gives bronzes of increnscd tensile strciigtli, elongation and rcductioii of area, which havc becn lnrgcly uscd in subiliacine work by tlie US. Navy. A vanadiumbronze cylindcr 3 in. diainctcr, 15 in. long, with n & in. ~~1 1 , siicccssfully withstood a hydraulic prcssurc of 9000 lb. A. W. Judgc, in "Aircraft mid Automobile Natcrials-Non-Perrob " (Pitinnn & Sons, Loiidoii, 1923, p. 58) states thnt ' I Yniinlium " (:in nluniiniuiii-vniindiniii nllpy), though only 3% hcnvier than aluminium, gives castings with a yield point of 8 tons per sq. in., n tciisilc strcngth of 11 tons pcr sq. in., and a corrcspoiidiug clongntioii of 8% in 2 in. Thc metal is said to bc uiinffcctcil Iiy sen-wntcr, atiiiosphcric conditions, liydrogcn sulphidc, carl)on diosidc, or sulpliuroiis watcrs, and to rctriin its hardness after heating bcttcr than does any otlicr known nluiu i 11 iu 1 i i alloy. 11. G. Corson ( I ' Aluminiuni niid its Alloys," 1'nn Nostraiiil Co., New York, 1926, p. 78) quotes Czoko as saying tlint the alloys containing about 63% vnnadiuiii arc wry rcsistnnt t o acids, niid nrc cxtrciiicly linrd. Scliirnieistcr states cvcn 2% vnnndiuin substaiitinlly iiicrcascs strength mid hardness, and that 4% is sriflicicnt for nny purpose. I?. 3'. ~~i i Ocfcle (U.S.P. 1,107,150-1) protccts the use of rniindiiiin
11s a hnrtleiicr in gold alloys for coins and for dcntal work. C. A. L:iisc (U.S.P. 1,141,051 and 1,423,914) uses tlic iiictnl in nn alloy for clcct,rical coiitnct points. 1'niiodiuiii often produces dircctly in nlloys ccrtnin pliysicnl effccts without tlic cspcnsc aiid daiigcrs inhcrcnt in licnt trcntiig.
(To be contkzled)
CANADIAN MINING AND METALLURGY Tlic prccious iuctals from the Proocl ore of tlic Intcrnatioiial Xicltcl Conipiiiiy, according to actual rcfiiicry results, arc valricd at 11 to 5 cciits of platinum for cach lb of nicl;cl sold, niid from 1 to 14 cents iu gold niid silvcr for cach 11). of coppcr sold.
The Ontario rchery, no\bciug constructed at Copper CIiiT, is follo\sing iii n gcncral way the design and prncticc of thc United Stntcs Ilctnl Rcfiiiing Coinpnuy's plniit nt Cartcrct, K.J. Tlic plaus for tlic refinery providc for thrcc innin buildiiigs, ntiincly, ail clcctrolytic tank liousc 300 by 400 ft., with 1200' taulis inndo lroui rcinforccd concrctc with lead liiiings ; two cnstiiig l~iiildiiigs, 0110 for crudc copper itlid thc otlicr lor refiiicd coppcr, tlicse ljcing cacli 200 by 1100 It. ; prcsciit pli~iis call for thrcc funinccs in encli 1)iiildiiig. Tlic rcfiiicry lins bccn Iiiid out with a vicw to tlic possibility of doubling tlic ciipncity of tlic plniit. TIic initial capacity mill bc 20,000,000 11). of nictal pcr nioiitli.
Tlic Canaclinn Stccl Corporation, Ojibway, Ontario, is makiiig lngo additious to its works aud equipment for tho fabricntiou of stcols and inntcrials thcrefrom.
π SIMILAR VOLUMES
This paper gives the following description of K of the endomorphism ring of a 0 finitely generated projective module. THEOREM. Let T be a ring and P a finitely generated, projecti¨e T-module. Let I Ž . Ž . be the trace ideal of P. Then K End P is isomorphic to a subgroup of K T, I . If, n phic to