Iron beam under construction at Carnegie Steel Company's Homestead Plant in Pittsburgh, Pennsylvania for the Empire State Building construction. American Bridge Company's Plant at Ambridge, Pennsylvania. A man shows parts of finished column with the help of a pointer. Animation shows the assembly of beam parts. Wing plates placed. Placement of cover plates. Side web section insertion. Other small parts assembled on beam. Finished beam carried by a crane and placed on a carrier truck. Workers observe the transfer.
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