68 TOWERS AND TANKS FOR WATER-WORKS. 



" LOCOMOTIVE FIRE-BOX STEEL. 

 [NOTE. Specifications of Baldwin Locomotive Works.] 



Tensile strength, 55,000 1065,000 Ibs. per sq. in. 

 Elongation, 20 to 25 per cent. 

 Carbon, .15 to .25 per cent. 

 Phosphorus, not over .03 per cent. 

 Manganese, not over .45 per cent. 

 Silicon, not over .03 per cent. 

 Sulphur, not over .035 per cent. 

 All plate to be manufactured by the open-hearth process. 



"RIVET STEEL. 



Tensile strength 50,000 to 60,000 Ibs. per sq. in. 



Elastic limit, one-half the ultimate strength. 



Elongation 2510 28^ 



Reduction of area 50 to 55$ 



If acid open-hearth steel ; 



Phosphorus not more than .075$ 



Sulphur not more than .06$ 



If basic open-hearth steel : 



Phosphorus not more than .035$ 



Sulphur not more than .04$ 



" BOILER-RIVET STEEL. 



" Same as rivet steel, except that a lower percentage of sulphur and 

 phosphorus should be asked for, and also a slightly greater elongation 

 and reduction." 



Owing to the comparatively small quantities of rivets re- 

 quired in stand-pipe construction, tests for rivet-rod metal 

 are hardly practicable, and therefore specifications governing 

 same being useless, it would seem that the practical method 

 of securing a suitable grade of rivet metal is to purchase by 

 the keg of manufacturers who have a standing reputation as 

 rivet makers, and for this certain field-tests should be re- 

 quired. 



Specifications. In discussing the suitability of the several 

 grades of steel for stand-pipe construction work, Prof. Pence 



