The Locomotive . increased above thatjust stated, without reducing the conductivity, a worthwhile discoverywould have been made. .Some recent methods of hardening copper by alloying have, to acertain extent, come about as near to actually tempering copper aswould seem possible. In these methods the metal, silicon, plays a mostimportant part because it forms silicides with other metals which inturn form eutectics with the copper. The deoxidizing effect that siliconby itself exerts plays no unimportant part in finally allowing the metalto be worked and by heat treatment to develop a high strengt
The Locomotive . increased above thatjust stated, without reducing the conductivity, a worthwhile discoverywould have been made. .Some recent methods of hardening copper by alloying have, to acertain extent, come about as near to actually tempering copper aswould seem possible. In these methods the metal, silicon, plays a mostimportant part because it forms silicides with other metals which inturn form eutectics with the copper. The deoxidizing effect that siliconby itself exerts plays no unimportant part in finally allowing the metalto be worked and by heat treatment to develop a high strength, with arelatively high conductivity. This latter, however, is considerably be-low that of pure copper and second only, speaking of alloys from thestandpoint of both strength and conductivity, to those of copper andcadmium. Alloys of copper wnth cadmium give, for a stated conduc-tivity, higher strengths than those with silicon. — Research NarrativesNo. 128, Engineering Foundation. 244 THE LOCOMOTIVE. [October,. Devoted to Power Plant Protection Published QuarterlyBenj. C. Cruickshanks, , OCTOBER, 1927. Single copies can be obtained free by callins at any of the companys a.^mcKS. Subscription price 50 cents per year -when mailed frotn this office. Recent bound volumes one dollar each. Earlier ones t~ dollars, Peprmting Tnatter from this paper is pertruiied tf credited to The Locomotive of thk H.^rtford Ste.^m Boiler I. & I, Co. Our Sixtieth Anniversary ON the opposite page appears a reproduction of the first page ofthe first issue of The Locomotive, from the date of which it willbe noted that the present issue marks its sixtieth Locomotive, we beHeve, is the oldest house organ that wasstarted as such and has been continuously published without inter-ruption. The first issues contained but four pages, approximatelyletter size, and appeared monthly. In 1880, however, the page wasreduced to its present size, the number of pages increased, and t
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