292 



load at the centre by doubling the readings on the scale for 

 the span and to the case of a concentrated rolling load by 

 doubling the readings on the scale for the load. 



It is applicable to any timbers by setting for suitable 

 values of / and s, but in the one shown provision is made for 

 five timbers only, the values for / and s being the averages 

 of a large number of tests made in the engineering laboratory 

 at the Adelaide University. As these are timbers of con- 

 siderable local importance, I append the experimental deter- 

 minations of / and s: — 



/ * 



Timber. 



Lbs. per 



Lbs. per 





sq. inch. 



sq. inch 



Pinus insignis 



... ' 6,900 



776 



Pinus maritima 



4,900 



730 



Pinus canariensis 



... 11,930 



1,250 



Oregon 



7,430 



444 



Eucalyptus obliqua 



... 14,100 



1,448 



