STRENGTH OF MATERIALS. 269 



TABLE, showing the transverse strength of iron square 

 bar, 2 inches by 12 inches long : Weight suspended from 

 one end. 



Round, 3 inches diameter ~by 12 inches long: Weight sus- 

 pended from end. 



) Breaking weight. I Weight borne with I I Value for general 



Material. I Lbs. safety. Lbs. Value. use 



Cast iron, i 12000 1 8000 I 240 I 17 > 



NOTE. The strength of a projecting beam is only one- 

 fourth of what it would be if supported at both ends, and 

 only one-sixth of what it would be if fixed at both ends. 

 The former is to the latter as 2 is to 3. 



To find the transverse strength when the "bar or beam is 

 fixed at one end and the load applied at the other. 



RULE. Multiply the value in the preceding table by the 

 breadth, and square of the depth in inches, and divide the 

 product by the length in feet. The quotient will be the 

 weight in Ibs. 



EXAMPLE. What weight will a seasoned white oak beam 

 4 inches square and projecting 36 inches sustain ? 



SOLUTION. 4x4 2 x40=2560-r-3 feet, projection, =853 

 Ibs. Ans. 



EXAMPLE 2d. "What weight will a cast iron bar 2 inches 

 square and projecting 4 feet sustain ? 



SOLUTION. 2 x 2' x 400= 3200-^-4= 800 Ibs. Ans. 



