A Study of Flow Phenomena in the Wake of Smokestacks by R. H. Sherlock and E. A. Stalker addresses the downwash of stack gases at the Crawford Station in Chicago. Theoretical and experimental studies, including wind tunnel tests with models of the station and isolated stacks, were conducted to understand the downwash caused by wind velocity. The study found that downwash occurs in two steps: first, induced by eddies in the stack's wake, and second, by dispersion within the turbulent air behind the buildings. The critical height for downwash is influenced by the shape and size of the buildings and wind direction.