378 



STRENGTH OF STEEL. 



In the author's torsion tests the results are the averages 

 of five tests of solid shafts and five hollow shafts : 

 THE STRENGTH OF STEEL IN SHEAR AND TORSION. 



On Fig. 183 is given a load-strain curve for a shaft 

 specimen of mild steel tested by the author. 



201. The Strength of Steel Castings. Some of the 

 best test results for steel castings are those by || Mr. Abbott, 

 of Messrs. Fairbanks. Mr. Abbott made a very complete 

 series of tests of steel castings in tension, compression, 

 and bending, the castings being made from similar 

 patterns by ten different steel makers in the United States. 

 Mr. Abbott gives the size of his test bars as follows : 



For tension, l^ins. diam., lOins. long between the 

 gauge points. 



For compression, 2ins. square, 2ft. long. 



For transverse stress, 2ins. square, and 2ft. long. 



||" Min. Proc. Inst. C.E., vol. Ixxxiii. 



