Swing bowling — when a delivery curves sideways in mid-air — has long been regarded as one of the game’s dark arts, not only deceiving hapless batsmen but also puzzling cricket-loving scientists. Researchers from Britain’s Sheffield Hallam University and the University of Auckland in New Zealand reviewed scientific literature on the subject and conducted their own tests to try to get to the bottom of the mystery.
From the earliest studies of the phenomenon in the 1950s to the “seminal review of sports ball dynamics” by NASA scientist Rabindra Mehta in 1985, they found humidity was consistently cited as a crucial factor in achieving swing. The researchers tested the theory using 3D laser scanners in an atmospheric chamber to measure the effect different humidity levels had on deliveries using balls which had been “aged” to simulate match conditions.
While altitude and the age of the ball both increased swing, the scientists did not discover any link between moisture levels in the air and sideways movement of the ball.