The fire was lit on the downwind side with a backfire.
However, the measured pressure distributions show some fore-and-aft asymmetry and the maximum thickness is slightly downwind of the half-chord point.
Section 1 started at the downwind end at which the fly was introduced.
The wake flow may still be detected in the downwind unbroken wave trough velocity profile.
The tunnel was equipped with a variable speed fan at the downwind end, a wave-maker at the upwind end, and beaches at both ends.
Moreover, had either cooling tower been the source of this outbreak, we could have expected to find at least some case-patients downwind from it.
The bait was placed at ground level about 20 cm from the downwind side of the traps.
In the centre of the downwind screen was a round hole circumscribed by a mounting ring to hold a releasing cage.
