rubber

plastic

brass

steel

2.1xl0⁵ kg/cm2

2.1 X 10⁶ kg/cm2

2.1 x 10⁷ kg/cm2

0.1 x lO⁶ kg/cm2

0.01 to 0.1

0.23 to 0.27

0.25 to 0.33

0.4 to 0.6

slenderness ratio and area of cross-section

Poisson′s ratio and modulus of elasticity

slenderness ratio and modulus of elasticity

slenderness ratio, area of cross-section and modulus of elasticity

of same magnitude as that of bar and applied at the lower end

half the weight of bar applied at lower end

half of the square of weight of bar applied at lower end

one-fourth of weight of bar applied at lower end