TEST OF A CAST-IRON BEAM. 



185 



of 700 lb., it will be found that the following differences 

 will be obtained : 



0130 

 0-065 



0-065 



0-105 

 0-040 



0-065 



0-082 

 0-017 



0-065 



0-125 

 0-060 



0-065 



o-ioo 



0-035 



0-120 

 0-053 



0-067 



0-096 

 0-031 



0-065 



0-078 

 0-012 



0-066 



0-065 



0-073 

 0-007 



0-066 



Taking the average of these 



0-065 

 65 

 67 

 66 

 66 

 65 

 05 

 65 

 66 

 65 

 65 

 66 

 66 



0-066 



0-115 

 0-049 



0-066 



0-092 

 0-026 



0-066 



0-069 

 0-003 



0-066 



0-110 



0-044 

 0-066 



0-087 

 0-022 



0-065 



14)0-918 



-a / inches deflection per each 700 1 b 



s 



(. load applied at the centre. 

 It has already been pointed out that the Modulus of 

 Elasticity of a beam under the given conditions 

 expressed by the formula : 



48 . 8 . 1 

 Here, 



W = the central load, 700 lb. 

 I = the span, 36 in. 



= the deflection corresponding to W, 0'0656 in. 

 I = the moment of inertia. 

 = (breadth) x (depth) 3 



12 

 = 1-03 x (2) 3 



12 

 = 0-69. 



