"different values of n represent different modes of buckling" (http://emweb.unl.edu/NEGAHBAN/Em325/21-Buckling%20of%20columns/Buckling%20of%20columns.htm )

Suppose you have an axis $O$, and two masses $m_1$ and $m_2$, which are joined to $O$ by a rod of $r_1$ and $r_2$, and $m_1, m_2$ are joined by $r$ (rods are maseless and rigid). Now, $\angle m_1Om_2 = \phi$, and you push $m_1$ by tangential force $F_1^T$. They're shown in the picture. Now, as ...

Suppose you have an axis $O$, and two masses $m_1$ and $m_2$, which are joined to $O$ by a rod of $r_1$ and $r_2$, and $m_1, m_2$ are joined by $r$ (rods are maseless and rigid). Now, $\angle m_1Om_2 = \phi$, and you push $m_1$ by tangential force $F_1^T$. They're shown in the picture. Now, as ...