Comparing Fig. 9 with Fig. 5, and referring to Table 4, we can see
the bigger the slenderness of a column is, the smaller the critical
load is. With the slenderness increasing, the amplitude of vibration
gets bigger. Meanwhile the equilibrium force of vibration is very
close to the critical buckling load, that means the vibration occurrence
becomes easier and earlier. On the other hand, the vibratory
energy of the column of great slenderness must be bigger