(Solved): Why does the Euler buckling equation contain 0.822 in the numerator for a column of rectangular cros ...

Why does the Euler buckling equation contain 0.822 in the numerator for a column of rectangular cross-section? 0.822 is the effective length factor for pin-pin columns 0.822 is an approximate factor accounting for end grain of wood members 0.822 "falls out of the algebra" for buckling stress of a rectangular section 0.822 is derived from an empirical relationship between crushing and buckling stress