146 CONTINUOUS GIBBER. [CHAP. IX. 



If any span is unloaded, the cross-lines coincide. The above 

 method of construction holds good when the supports are not 

 upon a level. If the difference of height of the supports ia 



represented th of the real amount, the unit for the moment 



i/L 



scale is , as is easily seen by reference to Arts. 81 



and 88. 



The above method of construction of the moments at sup- 

 ports was first given by Culmann. , 



