A square steel tube, HSS $4$ x $4$ x $$ is poured in concrete at the base, free at the top and $12$ feet tall. The column is made of A$36$ structural steel with E $=30$x$10\mathrm{³}$ ksi, yield stress of $36$ ksi and proportional limit of $34$ ksi. The factor of safety is $3.$ Determine the critical buckling load. Determine the allowable load. Could the column support more, less or the same load if made of A$50$ structural steel with E$=30$x$10^3$ ksi, yield stress $50$ ksi and proprotional limit of $48$ ksi.