438 THE STRENGTH 



conclusion of the experiments, the weights 

 were increased till the vertical rib exhibited 

 signs of being drawn out and crushed. 



27. The results from these experiments were 

 anomalous, partly through defective fixing;* 

 but they left no doubt that the extensions, and 

 compressions, were nearly equal from the same 

 forces, and that through their whole range. 

 And therefore that forces not Yery unequal 

 would have destroyed the piece, whether the 

 rib was drawn out or crushed ; a result very 

 different from what was obtained in cast iron. 



The means from the extensions and com- 

 pressions, with the three greatest weights laid 

 on, were as below. — 



28. In order to determine the same thing, 

 M. Duleau, who is the only writer that I am 

 aware of, who has attended to this matter in 

 malleable iron, has made some very ingenious 



• This objection dM not exist in the experiments on cast 

 iron, for in those the castings were rendered utterly immove' 

 able, by means of powerful screws. 



