INTO THE STRENGTH OF WROUGHT-IRON PLATES. 
725 
Experiment 10. — October 10, 1845. 
Malleable iron beam of the saine form as the last, 10 feet 7 inches long and 10 feet 
between the supports. 
Thickness, a= 1 ‘000 in. X 2*75 in. 
Thickness, 6= '380 in. X 8 in. 
Thickness, c= *420 in. X 4’30 in. 
Weight of beam =2/6 lbs. 
Weight 
in lbs. 
Deflection 
in inches. 
Deflection 
load 
removed. 
Remarks. 
885 
•020 
2,606 
•050 
4,364 
•090 
6,105 
•100 
7,835 
•140 
9,559 
•165 
•03 
11,257 
•195 
•03 
12,999 
•220 
•04 
14,728 
•250 
16,407 
•250 
18,108 
•290 
19,839 
•370 
21,553 
•475 
With 21,553 lbs. the deflection increased in four minutes ^025; in the 
next four minutes *10 ; and in four minutes more it had sunk to •34. 
22,387 
•590 
23,046 
Bent laterally upwards of 2^65 inches, when the experiment was discon- 
tinned. 
Ultimate deflection = •6. 
In these experiments it will be necessary to remark, that they were made with the 
narrow flange uppermost ; a position rather favourable to the strength than other- 
wise, on account of the increased area of the top flange, which is equal to 2*75 inches ; 
and the bottom flange is only 1*8 inch, a circumstance (deduced from subsequent 
experiments) favourable to the resisting powers of a wrought-iron beam- 
Manchester, April 10, 1850. 
