The Washington Toll Bridge Authority hired Professor Frederick Burt Farquharson to make tests of the bridge in a wind-tunnel. He was an engineering professor at the University of Washington. Professor Farquharson and his students built a 1:200-scale model of the bridge and a 1:20-scale model of a section of the deck. The first studies ended on November 2, 1940. This was five days before the bridge collapse on November 7. He found two ways to fix the problem: