DEFLECTION OF BEAMS 137 
orm moment is one-quarter of its resilience when 
simple tension or simple crushing. 
bar of uniform rectangular section, 3 inches deep, 2 inches wide, 
long, is supported at the ends and loaded at the centre with a 
i - Taking the maximum stress at 20,000 lbs. per square inch, and 
-30,000,000 lbs. per square inch, find the number of ft.-lbs. of elastic 
y stored up in this loaded bar. What would the answer be if this bar 
mple tension under the same stress ? 
