300 



STRENGTH OF MAT Kill A LS 



Problem 189. A piece of steel music wire was tested in tension and tin- following 

 data obtained. Draw tin- strain diagram, using loads in lb./in. 2 as ordinatcs and 

 unit elongations as abscissas, and lind tin- elastic limit, tin- modulus of elasticity, 

 and the modulus of elastic resilience. The wire was No. 25 gauge ; diameter before 

 test 0.<.">77 in., and sectional area 0.002615 sq. in. It was trstrd on a gaugr length 

 of 6 in. The sectional area at the point of fracture after test was 0.001:12 s.j. in. 

 Compute the percentage of reduction of cross section. 



TEST 



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250. Strength of wire rope. Tin- following report of tests of steel 

 rope is taken t'rmn ih,- II -.tenal Report, 1889. 



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