Go to your left to the large McCook Field Wind Tunnel. McCook Field, near Dayton, was an airfield and aviation experimentation station used from 1917 until the new Wright Field opened in 1927. This wind tunnel was designed and built at McCook Field in 1918 and was used for calibrating airspeed instruments and testing airfoils. The airfoils to be evaluated were placed in the choke-throat and viewed through the glass door as air moved over them. During operation, the air was drawn into the small end of the tunnel and exhausted from the large end where the fan was located.