8 



Proceedings of the Royal Irish Academij. 



all its wheels coiBcide, we then again have the semicii-cle standing on the 



span as the square roots of the mas. bending moments, due to a single rolling 

 load of 42 tons. 



ROLLING POLYGON GENERATING 



, A DIAGRAM OF SQ-ROCTS QF BENDING MOMENTS- 



S^TONS SPREAD 





J3 SOFEET. 



Fig. 7. 



Generatiiig Polygon, hiduding a dead load with a locomotive. 

 To include a uniform dead load with a locomotive. Add it to the uniform 

 load, fig. 8, numericaUy double the span ;. say 28 tons added to the 84 tons, 



