TRANSACTIONS OF SECTION G. 



757 



(The apparent exception occurrinpr in the diagram for the Phoenix columns is 

 clearly due to the effect of the friction of the platforms of the testing machine on 

 the columns of very small ratio of length to radius of gyration.) 



For higher values of the ratio of length to radius of gyration the breaking 





o 



Q 

 ^ 

 ^ 



^ 



C5 





strength per square inch decreases, and the law of decrease can only be expressed 

 empirically in each case. 



When, on the other hand, the load on the column is eccentric, we should not 

 fail to take this into account in our calculations, and should always compute tha 



