1903.] Stress and Strain in the Cross-section of a Beam. 



Fig. 4. 



21 



Lateral Strai 



3 



Experiments on a Wr ought-iron Beam. 



The following experiments were made on a wrought-iron l)ar 

 3*122 cm. broad and 7*614 cm. deep. The span was the same as 

 before, namely 91*44 cm., and the section under observation was 

 37 cm. from one of the supports. 



In this case the readings were taken at the middle of the depth and 

 at distances above and below of 1*2, 2*4, and 3*4 cm. 



The method of procedure was exactly the same as that with the 

 cast-iron beams. 



Table V. 



Difference of scale readings. Increments of strain per i ton. 



Distance 

 from centre 

 in cms. 



3*4 

 2-4 

 1 '2 

 0*0 



1 *2 



2 4 



3 *4 



I to 1 ton. 1 to tons, j i to 1 ton. 



+ 4*50 

 + 3-52 

 + 1 *90 

 + 0*10 

 -2*08 

 -3 *73 

 -4-87 



+ 5 

 + 3 

 + 2 

 + 

 -2 

 -3 

 -4 Su 



+ 3 -30 x 10" 

 + 2-58 

 + 1 *39 

 + 0*07 

 -1 *53 

 -2*74 

 -3*57 



1 to li tons. 



+ 3 -74 x 10- 

 + 2-91 

 + 1 *56 

 + 0-09 

 -1 -56 

 -2*70 

 -3*52 



