TRANSACTIONS OP SECTION 0. 831 



upon the experimental work and theory was then given which took into considera- 

 tion this variable. The object in view in the present paper was the determination 

 of the constants to be used in the formulas for the design of solid round-ended 

 columns. A series of experiments were carried out on columns of cast-tool steel, 

 Bissemer steel, mild-steel shaftingjrolled and annealed, wrought iron, and cast iron. 

 The results obtained are recorded on three diagrams, on which are plotted five 

 curves obtained from the experiments, together with the stress-strain diagrams 

 from the difTerent materials and a series of curves plotted to the formiilte 

 adopted. 



Some interesting results have been ohtaiued as to the effect of the ductility 

 of the material, its strength at the yield point, and Young's modulus of elasticity 

 upon the strength of solid columns. A comparison is then given of the Kaukine- 

 Gordon and other formulas. The constants to be used and as adopled from the 

 experiments are then discussed. 



